A kit for Sterns Metallica Pro consisting of rubbers needed to swap out on the playfield with an additional spare few rubbers recommended for high traffic areas that often need replacement first. Please note: this kits includes 4 additional (3/16") rings 4 additional (3/8") rings 2 additional flipper rings 2 additional (2 1/4" slingshot) rings 1 additional (1") ring

Few questions about this kit vs the Stern rubber sizes in the Manual (Sorry noob all I got)
A) Stern calls out 7/16th to be used vs what seems to be your 3/8th
B) The 1" rings seem to be used in two places, at bumpers and on bottom right side of the machine (Tho bottom is called out as 1 1/4") but you only call out 2 and 1 of them is as a replacement.
C) Where does the post sleeve go? I was not able to find it in the map or on my game.

Page 148 is where I got this info, thanks!
http://www.sternpinball.com/upload/games/metallica/pro/421/MTLAB1.PDF

This kit has problems. The other comment is correct. There is no place for the 3/8" Inner Diameter rings. They should be 7/16" Outer Diameter rings. These go on the small metal posts like the ones just below Sparky on the left and right, or the post separating the right out and return lane.

It seems that the slingshot rings the manual calls for are undersized. We have experienced breakage with the 2". I would recommend stepping up to 2 1/2"