Brian beat me with that suggestion.
You might try nitroslots.com , a drag racing forum.
Also, Jimmy Flintstone.
You didn’t mention what chassis you are using. A friend produces bodies for 4Gear chassis. I can’t find much other than this:
https://www.flickr.com/photos/61514613@N04/page1 . If interested, drop a PM and I can give you contact information.
Found a few examples on eBay. Look for seller kdog2008 .