Reddit reviews Kendall Howard 42U Server Cabinet Vertical Rail Kit

So, in my thread about this the other day /u/Mad_X suggested replacing the posts with these, which when priced out look to be about $76.80 for a pair.

They're 42U, but maybe they have 44U as well. Or maybe 42U would be ok for you anyway, and you'd just have space at the top/bottom.

Edit: Here they are on Amazon at $79.80 + $18.50 shipping for a pair of 2 posts ($196.60 for all 4 + shipping.)

Edit 2: Here they are on eBay for $78.94 and free shipping, so you'd be looking at $157.88 total. I'd do it now, but I just looked closer at my rack and it's not possible to do this. You may have the same problem. The front/back "posts" are actually built in to the rack directly and can't be removed, so while there is room and a place to put adjustable posts inside, my rack only has 1 set of adjustable posts for the back, the front of the gear can only be mounted on the very front of the rack, where the round holes are. The ears of servers won't go past them. I guess that's why they sell in pairs.

Neat! I was looking at getting some of these to convert the cab to square holes. I can get some 2U brackets to fill out the other 6U if it's a problem.