I'm assuming that this hitch isn't the one you were interested in 90 miles away, back in 2021
https://xoutpost.com/bmw-sav-forums/...ml#post1206071
but is a different one. Also assuming that it's for your '06 X5, I agree with Bdc101 that it looks unlike any for the E53; both the Curt and Draw-Tite hitches have the single strap/bar that bolts to the bumper mounting plate, plus have a structural extension that bolts to a crossmember behind the rear differential.

The hitch you've got resembles one shown on etrailer.com for a 2019 X5 (searched for that year/number because I couldn't find any reference to Curt SO19 or S019 anywhere on the web), but it doesn't quite look the same https://www.etrailer.com/p-C85VV.htm...BMW&hhmodel=X5

Might be an earlier model, discontinued by Curt. I did find a similar-looking hitch on etrailer.com in the Internet Archive's Wayback Machine https://web.archive.org/web/20080501...006_BMW_X5.htm, so there might've been others.

__________________
01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide