Vintage Yamaha Pegs

Bolt up no.  But I've made many of YZ or KTM pegs fit the older bikes.  I think I had MSR KTM pegs from the 00s on my old YZ465.   Usually you just need to grind the a little so that they fit between the frame tabs.  

VMX Racing lists them, but they appear to be out of stock today. Might be worth an email to ask. 

DC Plastic also lists them, I have had a lot of success with their products. 

https://www.dcvmx.com/Foot-Pegs/1977-1978-1979-1980-1981-1982-yamaha-yz…

If you are trying to mount modern pegs you'll have to use 10mm pins so you will be drilling the frame. I found a killer deal at the Chaparral parking lot sale on PC ti pegs. The needed some fitting but they went on easy enough 

1978 YZ400E - IMS Superstock PW50 #77317 Bolted up with zero modifications. 

- Pros: 
 They sit a little lower in the bracket than stockers giving my bad knees a little more room. 
 They sit back a little further than stock - giving my big feet more room to shift (I also replaced the stock shifter with a IMS that was longer) 

Originally picked them up off ebay for an XT 350, but they ended up going on the 465. Went on without much trouble except for a little fussing with the springs if I remember right

I put 2009 KTM 300 XCW pegs on my 1979 YZ 250. I bought them off ebay for $15.