I am new to your forum and am restoring an RT3

What other upper chain guards will work for this bike as I can't find an original

Great site!!

Yes they are rare and the one Mauser posted is gone. And most are cracked.

For the RT3 you can use one from a '72/'73 CT 175. You need to drill the holes so the grommet and ferrule fits. The 360 has a 39 tooth rear sprocket so the 175 guard will clear it. I also think it looks better. It will not fit the 250 with the 44 tooth rear sprocket.

I have a few RT3 guards. Send me a PM if you want one.

 
 

Thank you