The rear does appear to be a G2 housing while the front has the Dana diamonds. That clarifies things quite a bit with regard to what I'm looking at and where to focus my investigation. Thanks for your feedback and advice--I'll definitely give G2 a call and see if I can get some specs/documentation.
..I'm thinking hard about pulling the trigger on these. $4K + some risk/restoration/repair vs potentially $10K for new gear. I'll have to do some close inspection to make sure they're straight, but I'm having a hard time not jumping on this one. It would totally transform my rig and I learn a lot when I go through restoration. Wish me luck..
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