Had to get a little creative with jumper wires, but successfully communicated with my '90! I've dumped the CCM and attached it to this post.
From a quick glance, the VIN is in the same place, so it looks like we might be insanely lucky here; the fundamental stuff might just be shared between all CCM years.
For reference, my 90 has L98 engine, C68 HVAC, manual transmission, ABS, and the key is #11.
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