@Gregory SpanKerman I just did a fresh install with both Mk3 Expansion and Restock and I noticed the same issues with the SRBs and the docking port textures, as well as the LF/O tanks in the service bay. I tested the patch mentioned a few pages back that modifies certain parts and adds deprecated textures to a custom whitelist, and it seems it no longer works as @SuicidalInsanity fixed the texture issues an update or two ago.
I did however find this -
After a certain amount of trial and error (mostly error), I did some digging in the parts configs for the SRBs and the service bay and I found the remaining missing textures. So by adding these items to your whitelist along with the Clampotron one quoted, it should fix the issues with Restock.
Squad/Parts/Engine/MassiveSRB/solid_booster_cm.dds
Squad/Parts/Engine/MassiveSRB/solid_booster_em.dds
Squad/Parts/FuelTank/mk3Fuselage/Mk3Fuselage.dds
Squad/Parts/FuelTank/FoilTanks/RadialTanks.dds
Hope it helps!