I was just looking at my Tamiya M1A2/A1 HA and noticed some thing. If you are still trying to back date that kit to '91 I noticed two small changes that must be made that I missed earlier, they are small but if you are a nit picker you may want to know.
First the conduit that runs across the blow out panels should be V not square on old M1A1s with out the bustle rack APU.
Second the loader’s hatch hold open catch was on the blow out panels not the conduit on the ones with out the APU or ones that had the APU retrofitted.
Just wanted to point that out to you,
Take it easy,
Brian.