Caliper/MC date code help

[RPOLS3]

Digging through some old parts and wondering if these are original calipers and master cylinder for my March of 72 built Chevelle.

Thanks in advance for any help.

[XXXGoldL34M20]

Jake look back at this thread and it will school you what to look for in dates for calipers.

http://www.yenko.net/forum/showthread.php?t=140478

The Master cylinder will have a code hopefully on the top semi circle like this to help you out.
Here is a sample of a 1970 "BB" MC

[XXXGoldL34M20]

Also the date casting number of the back of the MC is after the D18 code off to the far right which is a Julian date.
In this case 47 is the 47th day of the year February 16

[XXXGoldL34M20]

MC cap,
Not sure if 72 had the same "Born With" master cylinder cap as a 1970 but here is what it looks like.

[RPOLS3]

Thanks!

[firstgenaddict]

The single piston calipers are Julian cast dated on the mounting leg boss - as well as Assembly stamp Julian dated - on the bottom of one of the mounting bosses.