Q. "The replacement cartridges #910-0310 and 910-0320 I purchased to replace the discontinued 910-024 and 910-025 not only look different but do not fit my faucet. Are these the correct replacement parts?"
A. These replacement cartridges 910-0310 and 910-0320 are the correct parts. However, if these new cartridges look slightly different from the cartridges you have, then you will need to use your old brass retainer nut and remove the outer, larger white plastic portion of the new stem.