Brent if you want get some old foam from A cushion out of an old couch or chair someone is throwing away and cut your own insert for in the car spray the foam flat black first and then glue down some black beauty sand for sandblasting and when it dries spray it with flat black paint again. I have done about 50 loads for my coal cars and they look better than empty cars and it only cost about $35.00 or $40.00 to do all the loads and you have the satisfaction of knowing you made them yourself. Just A suggestion and take care. Choo Choo Kenny