Whatever pic you tried to post doesnt work.
I think early 2wd cosworths...ie 3drs used an exhaust that split into two up the middle. And possibly some 4x4's too ??
ie
http://www.camskill.co.uk/m15b0s6528...E_COSWORTH_4WD
http://www.dcperformance.co.uk/subca...s-systems.html
http://www.ebay.co.uk/itm/ford-sierr...p2047675.l2557
So from a point of view of mating to a V-engine with two exhausts, one of those might be easiest.
Surely any local motor factors can get a replacement exhaust for your actual car though ?
http://www.ebay.co.uk/sch/i.html?_tr...at=0&_from=R40
eg go to this online catalogue
http://www.lvawebcat.com/webforms/fr...k&lang=English