My dear friend, if you had happened to read my post above, you would have read:
"The longitudinals are a lot shorter on the 4x4 towbar. The ones supplied with the 4x2 reach all the way to the holes the 4x4 subframe is mounted in. Otherwise the kits are the same".
Given your response of "Good luck fitting the 2 wheel drive to the 4x4" it's fair to assume you didn't.
I'll repeat, the only difference between the 4x4 and 4x2 towbar is the length of the longitudinal bars that insert into the rear chassis rails and this is purely because the holes the 4x2 uses are populated by the rearmost subframe bolts on the 4x4.
I never even slightly suggested one fitted the other.
The towbar doesn't go anywhere near, nor is affected in any way by the exhaust silencer or diff.
I seldom bother to comment on any forums these days, no one likes facts getting in the way of misinformation, speculation or guesswork.