disc calipers

Can anyone tell what year and applications the following would be used for?...
Kh 86145 and kh 84167
Thanks in advance

Like that old Chinese proverb said, "pictures are worth a thousand words"
Post a picture, and that will help out, more than those numbers.

Goggle is your friend :

https://www.finditparts.com/products/175258/centric-141-dot-63011

looks like they are kelsey hayes caliper numbers for pin style calipers for early 70's c bodies . . . .

Thank you! It's very appreciated! Awesome