This is a hard question 2 decribe but i will try 2 ask so you can understand, to start with this is a 1981 50 hp. mariner 4 cl. with 2 carbs. the gasket kit is Quicksilver 1399-5137 .ok as you know this kit contains 5 peaces, 2 gaskets, difram , and 2 other thinner gaskets are these diframs aswell ? one is a tan color and made of plastic or something do i put it in 2 because my carbs did not have this tan gasket in it only the black one. did someone leave it out at one time or another , I have a digram and it shows both in it but it dont show which one goes first. please help, thanks 