7&1/4 8&3/4 gasket interchange Q
for future reference, it would help if your question was more specific and you provided more information or context about what you were working on.
all i've seen you post about is 8 3/4 stuff, and that's all you've been asking about the last several weeks. when here it turns out that you're working on a 7 1/4 so the information that i provided you is likely incorrect for your needs.
specifics help everybody in these types of situations.