Stan, there is a guy in Arizona named Nathan that frequents Spyderclub. I seem to recall him having a lowered floor in a Thunder Ranch so he can fit. He also has a type 4 and flared fenders like Angela's car.
No more TR, so call Greg, I'm pretty sure that he has modified some cars with lower floors and pockets in the firewall. In a Vintage, there is more room as there is no torsion tube.
Carey: I have bottomed my old car when I had it sooooo low. I was going up a dirt/rutted driveway. I have not bottomed the new car as the ride height is not high but like Goldilocks: just right LOL! The old car had a huge nut between the seats. No not me! There was a large heim joint that the shifter rod slid through. That nut secured it on the bottom and hung down about an inch. I only hit that a couple times in the 40,000 miles I drove the car.