Originally Posted by
Iride01
I'm pretty certain it was a Shimano 2-piece crank. It's not bothering me to not know the exact crank or BB model I was talking about. It wasn't useful to the conversation as to why the cap or fixing bolt is longer for one model crank but not another. And was a bad example for a train of thought that I never fully completed.
You're right here, they are used on 4700-9000 for triples.
https://si.shimano.com/pdfs/dm/DM-FC0003-06-ENG.pdf
Not relevant to the OP question, but I am searching through specs to see how Shimano defined compatibility for the plastic bolts - because I am curious.