I’ve done this to a couple of my instruments…my T-40, and my Strat, for pretty much the same reasons. Both had the bridge pieces pretty well bottomed out when the nut was dialed in. Both had experienced major neck alterations, or exchange. When I did the first one, I wasn’t sure of how far I needed to go, so I purchased a selection of 3 from
Stewmack
I found the one that worked on the Strat, and packed away the other two. Years later, I had the T-40 neck worked over by Ray(RVA), and didn’t want to use the micro-tilt, as I felt it was what likely caused the original neck issue, so I dug out the other two. Sure enough one of them was exactly what was needed to get it set up nicely.
Some folks use whatever is around to get the job done though…I found a fender medium pick jammed into the neck pocket of a Peavey Tracer a few years back…seen matchbook covers, business cards, playing cards, and wood shavings over the years…and I just work on guitars for friends once in a while…I’m no pro.
I chose the full pocket pre-fab shims because I felt more comfortable knowing that the pocket had full coverage…especially after seeing that Tracer pocket, with the pick imprint in the neck and body.