Review on Delta Faucet RP60400 Leland Valve by Stuart Dunn

I ordered this part to fix a leak in my bathroom faucet handle - model #3578-TP-DST. I checked the Delta website and this part #RP60400 was marked as a replacement part for my faucet model. Delta themselves also confirmed this was the correct part before I ordered it. No, that is not so. It's too big to even fit properly in the handle. Now that my faucet is disassembled I'm guessing what I really need is part RP15513 based on pictures of it online and comparing it to the stem assembly I pulled out of my faucet. Delta needs to take note of this and stop misinforming people about this number. This is clearly a recurring theme after reading all the other reviews.