On my 84 ST500 I have a Suntour BB that looks like this:
Attachment 75971
Attachment 75972
The info on the BB dust cover is:
Taper: Vx
Type: Triple
Thread: 1.37 x 24T
Lug Width: 68 - 70 MM
Chain Line 44.5
I believe the spindle is 124mm.
There is actually a
similar BB for sale on Ebay, though the seller is scant on details (perhaps limited in knowledge) and the picture isn't good enough to read the dust cover info. He calls it a mountain bike BB, so best to ask for more info before bidding.
Also, since both sides of the BB are adjustable, the BB does not have the "traditional" fixed cup that requires a special fixed cup wrench.
stan
.