Another story from near past. The customer bought everything as parts and called the company. He glads he will pay only for labour. Nope. The parts were wrong, the regular store salesperson didn't know exact problem and sold wrong parts. Now the customer disagrees to pay for right parts we supply, because he already know the price he spent. And doesn't care how much cost ours. Go with one spot. We give warranty for only parts we install, not side ones.