Right; that would be the #43217-371-006Needle wrote:Aloha Octane,
We are almost on the same page. I am doing my brakes on my 75 now. I noticed on the rear caliper, there is an o ring in between the halves when you separate them, but it wasn't in my rebuild kit, so I am looking for one to match it.... .
I strongly suggest you get the right part for this.
This is the seal that keep things tight where the brake preasure
is distributed from the one half of caliper to the other half (and the piston in that side) so there's a LOT of pressure on that seal.
No dimentions are given in the parts book or elsewhere.
It's available from Service Honda at 5.48$
Thanks for your kind words
Octane