I havn't seen any companies offering air dams for the wedge over here in the US. There are some listed by Rimmer Brothers in the UK, but they are mostly for street use. Usually for racing the dams were fabricated out of sheet aluminum with rubber wear strips at the bottom. If you do a web search on Huffaker TR7 you can see some of the designs.
Lanocha Racing did purport to have body kits made from the original Group 44 coupes, but their website is currently down. You might drop them an e-mail though. Their car is incredibly awesome.
http://www.lanocharacing.com/
good luck
Kelvin Dodd
Global Sourcing Engineer
Moss Motors, Ltd.
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