there is quite a substantial amount of bulkhead that needs "fettling" to get the gubbins to fit in for starters

but if you can find a bulkhead with the neccesary big lump in it it's possible to cut it out and fit it to your car, the granada's are more likely to have it than the sierra's, the lump is the same shape as are the hole positions

all the one's i've heard of that were fitted to the pre 87 spec 3 door cars of both cossie and 4i variety were all retro dealer fit jobbies

when they did the facelift and got the saph then a/c was an option

don't discount the early xr4x4's, these were the 5 door versions that did have factory a/c as an option, totaly different to dealer fit