fab 9 rear end 9.5 third member fitment

Have fab 9 sheetmetal housing trying to get our 9.5 thirdmember 4:10 gear to fit anyone else ran into this issue or have pictures were to notch the housing Have called Mark Williams they say that it should fit

 

Get a Fel-Pro #2302 gasket from Summit/Jeg's/ Amazon, drop it over studs, spring clamp it down, scribe shape I.D. for ring gear size and width. Don't used an old one it might be too old. Revised about 3-4 years ago for 10" gear width. Use 1" drum sander in air tool with at least 36 grit drums.