Cody - I drove my car today for the first time with the Corbeaus, they feel great, but I am 6' and the top of my hair just touches the T-Top shade, so I hope that they do settle down even a 18" would be fine!
It would be impossible to waer a helmet with these seats, the T-tops would have to come off for sure.
The Corbeaus are so wide around the shoulder area, that they completely block the rear 14 window and hence give a blind spot, so I have to be very careful with lane changing to the left for sure.
Other than that I am very happy with them.
Aaron - Yes I am selling my old 300ZX Turbo seats. $125 for the pair and includes the modified brackets to fit your ZX, complete bolt in! I have placed an ad on here and zar.com as well, please refer to the ad for any further details. Shipping will be extra. First person to Paypal or send me the funds and its sold. Please let me know.
Regards - Yasin