Power brake check valve question

[Enoch]

I have a question on usage of original style power brake check valves . I have included two pictures on the second picture the one on the right is the one I am familiar with being used from 64 through 69. The two on the left I bought out of an original collection of 68 to 72 Chevelle parts. My question is has anybody seen this other style used. Thanks. http://www.yenko.net/ubbthreads/pics/usergals/2016/07/full-905-45774-2016_07_05_13.58.36.jpg
http://www.yenko.net/ubbthreads/pics/usergals/2016/07/full-905-45775-2016_07_05_13.58.22.jpg

[m22mike]

A few years back I was at a salvage yard in AZ. and grabbed a few of those. If I remember they came off mid 70's cars ?? I think one was off a Caddy.

[Enoch]

Thanks Mike I appreciate it he had 72 Parts also so that's possibly where they came from

[sixt9rsx33]

What year is this one?