Thank you for your question. Delta Faucet model # RP17451 is used on our 600 series faucets. We do offer a renovation kit to upgrade your 600 series to a lever handle. The kits is available in Chrome, Venetian Bronze, and Stainless Steel. The model number is RP54870. This will include everything to upgrade your 600 series except the shower arm and flange, showerhead, and tub spout.
This way you can keep your valve and just upgrade the trim.