Well it looks like I have bought the wrong part!

I have just bought a drivers side bulk head (the chair shaped cage one)
and I already have one!!!

I was after the passenger side,I have searched the sellers EBAY site & there isnt one I can swap it for

I was wondering if i could still fit it? but slightly to the right of where the correct one would be fitted to allow for the supporting arm to be bolted at the top?
SPRUUUUUCE!!!!! HELLLLLLP!

We are talking about a 56 plate Dispatch btw.