Did this mod tonight, couple notes:
Plan on cutting the existing fan wires and splicing to the new fans with heat shrink instead of re-pinning the molex. It’s what I ended up doing on the cabinet fan because the plug is different. Also the Digi-Key part I ordered for the monitor fan, same as OP posted, was such a tight fit into the molex they won’t fit all the way and it can’t be the right thing. Maybe they sent me the wrong ones. I may end up re-doing it as a splice with the original fan’s pins.
The backbox monitor is a heavy sun of a beach. Use a drill for the nine screws, I mean bolts, holding it in or it'll take you a week with a screw driver.
As for getting the cabinet fan out and put back in, I found that a ratcheting 1/4 inch drive tool was just the trick (see pictures). I don’t think theres any easier way unless you removed the whole PC box, and I can’t imagine how much fun that would be just to remove and replace 4 fan screws in tight quarters.
The cabinet fan goes label out, so the fan blows out of the PC box.
Six pack of beer on Pints & Pinball the mod difficulty skill meter and a noticeable reduction in noise!
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