The Bally reference part number #ASE-2836-2 for mini-posts, however as has been done in the past, you have to count the total number of 1 1/16 and 1 3/16 inch posts used in the game, which I cannot remember off hand, but I guarantee has been done many times.
I am sure another will chime in if they desire.
They are easy to identify on inspection otherwise.
Something that was not mentioned in the question was the version of the game for the playfield swap.
All '81 and '82 versions used "finned" or "ringed" mini-posts, many times there blue color turned to red (or pink) due to dyes that absorbed UV light badly, so some did not realize the original color. Xenon was the worst offender in terms of titles. I have seen several that did use red posts from the factory, which was a complete oddity on what was on hand at the time at the time of production.
The '84 version actually quite a few with "star" or "jeweled" mini-posts used from Bally-Midway, but I also saw a few that had "finned" posts as well from the factory dependent on when the playfields were constructed, but transferred to the "classic" production run.
That is why some '84 games actually shipped with the prototype white pop bumper caps, based on overrun of the playfields, but the final wire harnesses are different, as well as the '82.
Most "purists" prefer the "finned" mini-posts which are more expensive, usually in the color blue.