Hi, I don't have the answer for you, my HT is on the car for the winter, but....this might be a good place to mentioning something related to the topic at hand:
With the HT installed there seems to be always a gap between the bottom rear of the HT and the car body.....probably for good reason, to prevent the HT fro rubbing against the body ?! But it still bothered me.
Before I installed my HT recently I went to the Home Depot and bought some thick gray self adhesive whether stripping and installed it around the lower edge of the HT. When lowering the HT the seal compresses and forms a good seal.
Now I am happy, that nasty gap is less noticeable.
CHEERS !
WITT !