the 214 rod {DT/RT1,2,3 YZa/b 250/360} is different to the
311 rod {DT/MX250/360a}
i just scored a N.O.S. rod to put into my MX250a. had to get the shims,bearing & pin seperately.
it all cost a bit more than i'd hoped but it's all ready for instalation and soon to be back on track again.
check if you can whether the big end pin is 24mm or 25mm and a good yamaha parts guy can sniff one out.
short for time right now but will post some more info when i can.