looking for an air dam for ITA
 

We're building a second car for myself to drive. The car is an 84 chassis. All the Dams I've seen for 81 up are even with the front of the bumper. I need one that pitches back at the bottom about 3 inches. I want to put an air splitter at the bottom of the dam for down force.

We are currently using the one Van Steinberg(sp?) sells. It is good but the bottom of the dam is even with the bumper. Rules say that nothing can patrude past the bumper.
I have seen dams like I want for 79-80 cars. Anyone know where I can get one for a later model?

Thanks,
Mike