Yep, they are TOUGH. I destroyed a set of decent cutters going through those cables.

I doubt that is an original regulator unless you are seriously lucky. That vapor barrier can be removed and reinstalled so that you could never tell it was touched if you are careful.

Battery access is a bit of a pain, but not too bad. FYI you can remove the regulator without disconnecting the airbag. I usually zip tie it up and out of the way with it still connected. I have the ability to reset SRS lights but it's easier to just tie it up out of the way.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)