Good advice Yamfan

Gone are the days like back in the early/mid "60's where i worked when a customer might bring a rim & hub in but no spokes to reference.
We would have a pile of blank spokes with 'no' bends.
So had to bend 10 short & 10 long bends for the brake side. 40 spoke wheels.
Then the 'off' brake side might have only semi bends so 20 of those.
Then the fun bit was working out length. If we were lucky & was a common wheel i could find out the offset easy enough as there was usually a similar bike close by.
Then i'd lay the hub face down on the brake side & block the rim up to the offset then cut the spokes close as could guess/measure to correct length.
After that came the fun of threading which was using a hand turned cut thread machine. In later years we went 'upmarket' with a rolled thread machine which took the same effort but made stronger spokes as no metal removed--just squashed up into a thread.
Then came lacing up & hoping i'd made the thread long enough so as to 'not' run out of thread before spokes are tight.
Fun days those "Not" but was just 'what we did'.
In this case i'm talking turning a 19 inch wheel into a 21inch for scrambles [MX].
I'll look for a pic of one the same & link it if i can as direct pics aren't working.
photos.google.com/photo/AF1QipOjlVTZj0z7...qd8sojLO51ufF04iXK9C
Looks like it crosses only Two on the brake side & four on the other side just to make it more fun to build.
All a distant memory from almost 60 years ago.

Thanks guys, I seen the spokes you linked to, will need to figure out exactly what I will do from there. I haven't completely committed myself to respoking my MX250, but the spokes are rusty to some degree, one is bent from my maiden ride when the brake stabilizer dropped and the bolt head snagged a spoke. I originally was, and may still soda blast everything and clear coat it all while still assembled, but my gut is telling me not to do so.

If I do go for the replacement, I will most likely get everything trued up, spinning well, then drop it off at a shop that can torque the spokes the rest of the way. That is if I can find said shop. This endeavour is just starting, I still need to pull info together before I pull the trigger on this

I’ve used vintage _001 from Thailand on 3 enduros with no problem. Next time I’ll also look at Airbornesilva suggestion too. Buchanan spokes is another one

@Ht1kid, thanks for the confirmation. I put the spoke set on the Ebay watch list for that vendor, until I get the funds for it if I decide to go that route. My plan so far, is to go with the cadmium plated ones so they are described on their site, rather than the chrome, since on my MX they were not plated with chrome to begin with whether it be zinc or cadmium. Stainless steel is still an option I may go with too.

$110 each wheel

I managed to get the spokes from vintage_001. All the lengths and bends are spot on but I did notice the spokes for the rear wheel do not have thicker bottoms so to speak. That difference was not so bad, although I wasn't crazy about it since they were advertised to be for a '73-74 MX250 and MX360 and no other. The real issue I have is the size of the nipples, they are a bit smaller than the originals. If I had steel rims, I wouldn't sweat it, since I have aluminum rims, I am thinking there is a reason for the size they are, with the addition of a washer, that I had no idea was on there until I took everything apart.

Maybe I am being overly concerned for nothing, but I surely do not need the spokes popping through the rims while bouncing through stuff. Has anybody seen this difference in them and used them in a situation like mine?

Spoke nipples

I wouldn't use those if I planned to ride it. I'd be afraid of the same thing.

Buchanan's isn't cheap but they can probably get you the correct spokes made up.

I would send them a message and get my money back When I got mine the Yamaha shop didn’t have a complete set but we compared the new ones to some of their original ones and they were the same. I will not lace wheels again did that 40 yrs ago they said they didn’t have any issues. Sorry that happened to you 

I'm sure washers were common with nipples as original equipment by memory on alloy rims. But nipples were the right size for the rim & washers were no bigger than nipple head. Maybe just stops possibility of chewing the alloy while tightening.
I shouldn't admit it but back in "Desperate Days" i do recall cupping a bigger washer into the hole for a less than ideal nipple as a "get me by" repair.