I bought a Monogram '89 Thunderbird SC on EBay a while back. 25.00. I've got it all custom painted, 5.4 supercharged motor from the Mustang Stallion kit, Saleen wheels, spoiler, and stripes. Almost done and then I realize the back window is missing from the kit. I really need this and do not want to spend the money for a complete kit only to end up using the one piece. Can anyone help?