Wheel options for Ford-based Spartan

[Scimher]

Hello all - just joined. Nice to meet you all......My first question is concerning roadwheels (as above)... I have 13" steels on 1990-build Spartan with a wire wheel trim missing & with cracking between the treads on the front, offside tyre so it seems opportune to try & replace the wheels/tyres....hopefully together as one. Have found myself looking at Sierra alloys but have no idea what others have fitted? 4x108 seems a popular PCD but no idea about ideal ET offset etc? Any help/advice gratefully received.........solution must be cheap as poverty stricken!...