Typical victory pin, used for foorpegs, foot master brake cylinder, etc etc .... But 4,5 " long ????? Never seen that ...
The brake calipers retaining bolt looks completely different ... Jas a threaded end on 1 side, and a funny looking ball & notch on the other side
But there is a SLIDING pin with rubber boot inside the brake caliper that is 2" long ....
Sorry i cant help to indentify the locking pin ....