Well I got the 20 amp fuse in from my parts department tonight. The other one is not in yet. Anyway part number 68202896AA is a 20 amp M case fuse. It has the LF for Little Fuse brand name right on the plastic. So I paid $4 for a fuse that can be had from The Electric Depot for $3.98 for a pack of 5.
Kirwin - It looks like that LF (Little Fuse) is a touch longer across the top than the Jcase or OEM fuse. Have you test fit it to see if there is a clearance issue in the slot?