I ordered my bellypan from GMpartsdirect. I had no trouble with them but there was no communication. I got a shipment email a day before receiving the box. There was some odd quirk regarding shipment destination though. I beleive they required UPS shipment to a PO Box or something crazy. I had to counter it by utilizing both address lines or appending po box to zip like 44140-0241. I don't believe it was the latter as that is what I normally do, but it was something awkward.
Good luck.
Do you know the part # for the belly pan?