Time messing around with rusted bolts and God knows the condition plus then you are doing the same job twice to save a total of maybe $150? Much rather just buy a brand new unit and not have to worry. Other items like interior or switches yes, or anything that they want stupid money for I can see. I needed coils for a v6 Audi that were $250 plus, I did go to the yard and get a good set for $15, I think over a 10x savings that was worth it.