1. Converted the standby alternator with an extended shear coupler to allow it to be used with a 0.75" spacer. (This spacer is necessary because of the previous installation of a 1.25" oil filter adapter spacer.)
2. Removed the old mounting studs and installed new, longer studs for the alternator.
3. Installed the newly-lengthened standby alternator on the engine. (For future builders who might be reading this, the bottom-left washers and nut are perhaps the hardest items to reach on the entire airplane. It took all of the tools shown in the last photo to get it done, and it took the better part of an hour just to get the nut started on the stud! To tighten it, I ended up turning the nut 1/64th of a turn at a time with a repeating sequence of tools as follows: A 7/16" combination box/open wrench (each end in turn), then a 7/16" slotted crowfoot wrench. Good luck! (If you can find one of those Snap-On curved wrenches, that might help.)
4. Attached the GPS antenna mount to the firewall loosely, to check the clearances from the alternator. Everything looks good.