The 17888 has the extended seal surface like the A11424. I got a seal from Carquest. My guys are over there several times a day. I will have to wait until I get my statement to find out what the Carquest number was. I had thought of cutting the seal surface off of the old bearing and putting a regular tapered bearing in, but the cup and cone are still in Timken's current books. My distributor had them drop shipped from Timken because he didn't have the cup on hand. He had the cones in stock. I didn't think it was worth the effort of making something.