Originally Posted by
seypat
Bolts for any 86BCD crank like the Stronglight 99 should work. You'll probably need a longer BB spindle. Otherwise, the 3rd ring will scrape the chainstay. You have to move the crank out to make room for the other ring.
If there is room beside the carnkarm he could put the big ring on the outside, with the spacers he's going to need anyway.