Just refurbished my 4 pot 2WD calipers for an upgrade on my DOHC sierra together with Ghia rear disc brakes. My only problem is that there isn't any Cossie front discs for sale in my entire country. Considering dodgy customs workers I really don't want to order from an another country unless I really have to. Long story short, does anyone know if there is an another car's brake discs that are compatible (or atleast close in specs) to 2WD Cossie discs?

 

Why are you upgrading with 2wd Cosworth calipers to start with? They don't fit the standard Sierra knuckle, as the thread on a standard Sierra is in the caliper, but on the 2wd Cosworth caliper it is on the knuckle. So when trying to fit a 2wd Cosworth caliper to a standard Sierra knuckle there won't be any thread in either hole. Besides that, the bolt holes are not the same, M10 on a standard Sierra, M12 on the Cosworth and I believe the spacing between the caliper's ears is also very slightly different.

If you want better brakes there are much better and lighter 4 pot calipers around than the 2wd Cosworth.