Looking to rebuild 2 AT1s this year ('69 & '70), so I'm going to rebuild the crank assemblies. I will need new rod assemblies, and I currently see 2 so far, VINTCO and PRO-X brands. The VINTCO looks nice and the website is good. I see PRO-X on eBay as well. The price difference is about $75. 

As neither of these will be used hard (i.e.- raced) would the less expensive PRO-X be acceptable? Or would I be better advised to buy the more expensive assembly, and know that when the bikes eventually go down the road to the next user, that they will have had the best available?

I'll be sending them to Bill Bune to do the work. (Hmmmm..... I should also probably ask them this as well, eh?? 

Ive never bought a vintco rod kit but i did buy a prox kit for my Honda xr200r. Made in Japan, everything looked and felt great. I have bought the cheap off brand rod kits from ebay for 250/360 rat bikes i play around on and so far i haven't had any issues with those. I think its safe to say that either one will do you just fine. Anything made in Japan is good from my experience and what i try to stick with as much as i can when restoring.

Appreciate your thoughts. Mine are similar, in that if part is coming from Japan, it is most likely quite serviceable. The rebuild of at least one of the 125s under my care now will be pretty complete. Maybe not "concours", but to a reasonably high standard,

Thanks much!

Pro-X is good stuff.  Price is not an indicator of quality. 

Be aware that the small end bearing width is different between the 125 and 175, the rod kits probably come with the narrower 125 bearing?

I'm kind of surprised the Yamaha rod is now NLA.  It fits many, many bikes over several decades.    

Thanks Mark. I did see on the parts book the different part #s for that bearing.

Good to read the comment on the Pro-X as well!

Regards!