.......that the CBSS compressor prevented mounting of the dozer kit
Gary,
Never thought of that problem until now. I'm wondering if they just didn't delete one of the two compressors off the angle drive gear box and replaced it with the hydraulic pump for the blade kit. The system was "Dual-Redundant" that way. Looking at the CBSS system I'm willing to bet some maintenance NCO or Warrant came up with the idea. The M551 had only one compressor in the turret and it was electric drive. Can't see why an A2 couldn't operate with only one, just install the blade pump on the right and make longer lines for it. Most of the kit was on the outside of the hull. That's what I'd recommend. Depending when this mod took place would most likely change my guess on how many were made .
I haven't really looked into that part of the A2 (Blade Kits), but since you brought it up I might. Now I'm Curious how they actually did it .