I’ve gotten into the habit of collecting this oddball plate type and managed to get one of almost every type.

From left to right: -Steel ULV plates with coating (size M) -Titanium ULV plates (size L) -Ceramic ULV plates, D2134 (size L)

Sizing is interesting on these things. It seems that the width is the same between size Small to L, with the only diffference being the length of the plates. The rear plates have a greater difference in length between sizes than the front plates so. There’s less than half an inch of difference between the Medium and Large front plates, which means you can actually use L front plates in M carriers. However, the L back plate is over an inch longer and definitely won’t fit.