Not sure how helpful this post will be but thought it was worth documenting a few things. All of the VA hardware is SAE and I don't really like the look of separate bolts on the mounting brackets where you can run a longer bolt all the way through. I changed out four of the SAE bolts for (1) M10x125-120mm for the alternator and (1) 130mm of the same for the compressor. I also changed the one short bolt on the AC compressor bracket for a JIS M10x125-40mm. I'm using JIS flange nuts on all of those. As a total aside, an M10 JIS has a 14mm wrench size. I couldn't find one longer than 100mm so the ones I bought take a 17mm wrench. Not a big deal but I'm not sure if JIS goes to 17mm above 100mm or if it is just something McMaster Carr and BelMetric don't carry. Regardless, it all looks a lot better to me now.
The two SAE bolts that are used for the adjustment hold down on both brackets cannot be changed as the brackets are threaded but I did change them out to Grade 8 bolts. Edit: The M10x125-20mm bolts they sent to mount the bracket to the block are not JIS so they have 17mm heads. I changed those out to JIS and both 20mm or 25mm length will work.
I looked up a '77 FJ55 alternator belt and cross referenced that to Gates. It showed a belt with a 15A section, 15mm top width, and 40 degree angle. I then measured the outside diameter of both using a 59" belt (with that same specification) that I had previously used but was now too long with the new bracket. I ordered the two belts below with the longer one for the A/C compressor. The alternator is perfect but I need something just a bit longer for the compressor. I have just enough clearance for the original 6 blade fan but I want to chance to the OEM "with cooling option" 8 blade fan. Unfortunately it's 3/4" diameter larger so I need to gain another 3/8". There's plenty of adjustment left in the A/C. Just need to find a belt between 58 1/4" and 59". Gates doesn't show one with that same cross section but maybe someone else makes one.
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