Dimensions of Mamiya RZ Pro II film back

I'm currently looking at a case for my film backs (Lowepro AVC 2) which measures:

Internal Dimensions: 21.3 x 8.8 x 21.1 cm (8.39 x 3.46 x 8.31 in)
External Dimensions: 21.6 x 9.3 x 21.6 cm (8.50 x 3.66 x 8.50 in)
Weight: 0.4 kg (0.88 lbs)

My question is whether the film back will fit inside this case?

I measured mine with the added cover and it's, 5" x 5" x 2 3/8". I just added the 65 L-A and both of the extension tubes. So I'm also looking for another case too. I was looking at the Tamrac add-on's for mine. Let me/us know how you make out.