Ok my problem is alot larger than originally thought.
On the AWD front diff, the left (driver's) side has 6 bolts, no nuts. The bolt goes after a washer and threads directly into a shaft piece that is within a circular housing. The bolts are in pairs, 2 at each 120 degree interval.
My boot is completely removed, all grease had evacuated the area, and not sure how well the clamps are holding up. Since the entire boot assembly was only $30, I ordered that whole replacement.
The washers were 5 cents, and each of those 6 bolts were $1.25 a piece. I ordered all 6 of those along with this shaft that enters the diff housing. This shaft was an absolute necessity at somewhere near $240 because in one of the 6 threaded holes, the previous WRONG BOLT had sheared and was stuck inside.
Could I have repaired this? Yes. But I feel the $240 to know that this possibly now faulty component will have been completely replaced with all proper OEM bolts.
I will be re-installing all of this probably as soon as the parts get here. $298 shipped for all the parts required to repair, plus I gotta clean up this entire area and repack with grease.
So FYI, if you ever go to a shop that seems too good to be true, question their work, and set something like this up beforehand to let them know that if ANYTHING required is missing, you will personally order all necessary OEM-ONLY parts. I wish he would have told me that they were missing these bolts and ended up using random bolts that fit around the shop that ended up costing me $300. Half the price I paid to have the motor installed.
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Part #'s 38231Y shaft in pic1 (~$240), 39100A bolts (~$1.25 ea), 08915-1381A washers ($0.05 ea), and the entire inner CV boot assembly 39156KA in pic2 (~$30)