If you compare the tech drawings in my previous post, you can see that the 7V and 8V are the same, except for dimension L4... the 7V is for taller (lower numerical) ratios, the 8V is for lower (higher numerical) ratios. Unfortunately the part number in the drawings appears to be a diff carrier casting number, so it doesn't appear in the EPC, making it harder to cross-reference. I only know the 5V cross references for sure.
Most likely you'd need to swap in a 210mm diff from a different car (C43 perhaps?) and then put the appropriate Quaife into that housing.
