might suggest too that the bachman metal wheels for thier skips and mine cars are a compromise between the LGB sized FRR wheels and other diameter wheels-in case you need to make come changes
i have used these on the pre FRR series tiny LGB cars-ie the wine barrel, tipples, etc and it sort of helps -the full size LGB wheel looks a bit off and the bachman sets look better-and they arent too dear
i used them on a hartland car and it helped the overall look
and tell us which FRR loco did you purchase-pics if you can please
let me try to get some pics taken for you of some of mine -later this weekend