suspension arm blocks for cat sx3 yay or nay?

[schmacher]

i just got a newly built sx3 and was wondering if i should get the aluminium blocks that mount to the lower bulkheads front and rear and also the aluminium eccentric bearing holders too...i have an original sx that i can borrow them from...not sure if it's worth the hassle to rip apart the one car to upgrade the other one...advice ?