cab mount bushings

[rich67]

maybe you guys can help a dummy. just opened a cab mount bushing set that i recieved with a truck purchase. it has two 3" bushings, two 2 1/2". two 1". two 3/4". then four what i believe to be bottom rubbers. and hardware which i believe is short 4 bolts. only 2 in kit. kit has no instructions with. getting ready to put front end on my gmc antrying to figure which ones to use. also cab is on truck already and has a 2" lift. im thinking i'll have to either find some 2" spacers or refab 2 1/2s. then use correct front mounts out of kit. anyone know what the correct front ones are? gonna try to load pics tomoro. any help appreciated, rich sorry such a long read.