I have a B40 cab I'm restoring. It does not have a grill. I just bought a V4 grill here: Vintage Style Ampeg V4 Grill 25 5/8 X 27 5/8 | eBay Since I have taken it as gospel that the two cabs are identical except for one has 10" and one has 12" holes in the baffle, I didn't bother to measure my cab before I bid. The V4 grill is slightly too long on one dimension and about an inch short on the other. Would someone please measure their V4 and/or B40 grill so I can get to the bottom of this?