Sorry David, been over 10 years since I owned a 2+2 now. I can't recall what all the differences are, but I remember differences in the rear struts.
Honestly, you may need to just pass this set on again on eBay or to a 2 seater owner and buy another set. I know it sucks, but sometimes you gotta take a small hit on stuff like this, live, learn and move on.
I recently sold on an alarm I was going to install for the same reason mate.