Passenger-side Aero-style Mirror adjustment (assuming that a spacer is the right way to go):
Parts needed:
(1.) I looked in my local hardware store and found some small, 3/4" outer diameter, clear suction cups used for hanging small things on glass surfaces (National N259-937 V2524). You'll also need a 10/32 X 3/4" pan-head screw with captive star washer - get it in Stainless Steel, if possible, and check it against the threads of the threaded receptacle on the back of your mirror (yours may be metric).
Change Process:
2. On the suction cup, I cut off the "nub" where the metal hook mounts to the cup, and punched a hole in the center of the cup with a paper hole punch (single hole version - I use them for punching clean holes in gasket material). The hole size depends on the size of the threaded part of the back of your mirror - your size may vary - mine was about 21/64'ths. You have now created a "spacer".
3. With scissors, carefully cut a small cresent off one side of the spacer rim to allow the mirror clearance in one direction - max width of about 1/8" (see photo)
4. Push the cup over the threaded thingy on the back of your mirror, concave side to mirror, and align the removed cresent side with the Drivers side of the mirror when assembled to the mount.
5. Use that new Stainless screw you bought to re-assemble the mirror to the mount. You may have to Dremel off some of the length of the screw to make it all fit right, depending on the thickness of the suction cup "spacer" you have.
6. Lightly tighten and adjust your mirror to sight down the side of your car, or where-ever you feel comfortable. Once "dialed in", tighten a bit more to lock it in place (you know the drill, here.....don't over-tighten!!).
The benefit of the clear suction cup material is that it is soft and allows movement until tightened, and almost becomes invisible when everything is assembled together. It'll also act as a seal against water and dust getting inside your mirror.
Hope this helps!
Gordon (a.k.a., McGyver)