Mark, the APU is in fact on sprue B and not on sprue J. It is step "I" in the instructions and consist of parts B25, 26, 34, 36, 37, 40, 41, F54 x2, and Z21 and 22.
Now if your talking about step "M", that is the AC unit that goes on a M1A2 SEP and the full interior kit is only an A1 or A2 version.
Lloyd, can you show a picture of what you are talking about in step "L", with part C24. If you are talking about the construction of the suspension, part C24 is the center support arm for the side skirts.
I've done the review of the ODS and 3 in 1 kit for the sight and will be doing the review of the ABV kit. didn't get to do the review of the interior kit, but I am working on that one.
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