the IC2 builds that include them crash with GT 5.10
Try putting this in the mods folder too. It's not really a proper patcher because I was feeling lazy for what it actually needs to do (very little), so it is named to try and load before IC2's version can. If you get the same crash, transplant the CropCard.class from within the jar into the proper place within the IC2 one (but as that's a nuisance so ideally you won't need to do that).
EDIT: There's a better, proper one here: [GregTech-5][1.7.10-FORGE-1355+][Unofficial but approved Port][Stable] Even GT5 Experimental is slowly getting stable.