Questions...Bagging a Sonoma

i noticed that the carrier bearing cross member and the tranny cross member sit below the frame. where can i get new cross members. also i was looking at the silver star customs 2 link, does anyone have this or know anything about it. im pretty sure i need to cut out the some of the inner fender i think i might be wrong. is there anything in the engine compartment that needs to be moved to run 18's?