Either wheels fit just fine - just make sure they are for the MGF /TF and not other MG's or Rovers as the PCD is different I think.
Yep, Adam's correct. Only wheels from the TF or F will fit. PCD 4x95.25. Confusingly, other MGs have similar style wheels in 16 or even 17", but the pcd is different.
These are the same pcd but they use 15"s on the front and 16"s on the rear. The 16"s are 8" wide and the offset is less, so are probably too wide to use on the F/TF.