Yep, but $75. Come on, for a damn wrench?
Screw that crap (LR prices). I'd take a not too favorite box wrench, cut off then Tig welded a square drive onto it. A cheap tool you'll never use again anyway.
Sunnen 1/2 ton transmission jack the best tool to own when owning a LR. Eight 9" x 9" x 24" long structural beams (EFCO SUPER STUD) filled with bolt holes with chocks allowing any vehicle lifting height bolted together be it frame, suspension (axles) or under mounted tyres.
A solid secured vehicle you can yank around with safety. I hate 3 legged jack stands after seeing a fire rescue removing a person after an engine install went bad knocking the truck off the stands.
Followed your adventure, sorry to read your "tapping out" when your almost there. Relocate stands then pull the diff.
Almost sounds like a job for Mr. Hole Saw making a vent hole through the firewall "if" that's what it took to get at those bolts. Compact tight spaces, try working on any *** car especially a Subaru engine.
Land Rover made in England by Beefeater's, go finger.
PS, dad called my 95 D1 the "Limey Lemon" except the 215 Olds engine he used to modify and hot rod years ago. Same engine attraction had me and why the LR purchase, the 5 spd closed the deal.....~~=o&o>......