I have a 2001 Lexus RX300 and I want to replace the leather seats since there's cracks in them. How do I get new genuine leather? Could I go to my local upholstery place to have them order leather and do the work?

Read the thread below yours on the index titled Upholstery worn and torn etc for some guidance.

You can go to your Lexus dealer and have them order new OEM seat covers... or look on eBay for used, but good condition replacements.