Will 15" wheels with 4x114.3 bolt pattern fit
 

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do you have an SE?

82 gsl

no

You need wheels with 4X110MM lug pattern,which is a rare one.
Its a general PITA to find a good selection of wheels for non-SE 1st gens...

non-se I suggest either going with some wheels that you know you can find like panasports, enkei mesh, roh snypers...either that or buy some wheel adaptors and go to 5*114.3 which will give you almost infinite options...

actaully, if you have supra rims, or any other rim which uses the same style of lugnut seat, they WILL fit.

no lies guys, i bolted my MKII 14x7's to my 83 gsl
the centerbore is identicle too.

these lugnut seats are the crazy ones where the nut has a sleeve that goes down through the hole in the rim, so the rim applies force against the nut, and not the stud.

the offset is also pretty close to zero, meaning that the rim makes the cars stance much wider.

also, captain homebrew here managed to force mustang 15x7 4x108mm rims onto the gsl.. it was hard the first two times, but gets easier with practice (and hole elongation due to impact torquing)

i sent you a pm with all i know on the subject

hope it helps