2wd is 16mm, 4wd is 18mm, escos is 22mm, and silly money s/h, hard to come by.
A SCORPIO is 21mm from a SCORPIO 24 VALVE COSWORTH, and fits straight on, the GRANADA SCORPIO COSWORTH 24 VALVE is 18mm same as 4wd cossie sapph.
The PROPER scorpio is the BUG EYE one at 21mm, just ordered one, £40 delivered, going to drill out the 16mm poly bushes to suit, after freezing them first of course!!
tabetha