[changzuki]

A low budget tip:
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Centurion's side windows are fixed and as such, on a sunny day it can get "rather warm" in the cabin.
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The optional sunroof helps to let the heat out but fresh air mainly enters through the added cowl vent. This "vent" is little more than an opening covered by a metal floor grate. With the base of the windshield generally being an area of positive air pressure, a substantial airflow is possible through this vent.
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There are times when it's necessary to close the cowl vent and nothing beats cheap-n-easy, as long as it works. The cheap-n-easy solution to capping off the cowl vent is an oversize flexible refrigerator magnet.
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It works and it is "cheap-n-easy"!
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~CrazyJerry