I need a new clutch for my 85 z28 305 lg4. I went to autozone and they have 2 different ones for that engine. One is with 10.4" clutch (duralast nu0056 in stock 112.99) and the other one says without 10.4" clutch but dosen't say if it's bigger or smaller (LUK 04-019 special order 121.99). SO I measured my clutch and it's about 10" wich one should I get. I don't want to order one and wait for it to be the wrong one. Thanks.