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				 shift lever 
 
			
			Below is a picture inside the cab of my C15A #12 . 
 I have never seen a #11 or #12 cab Chev with a shift tower gaiter but Phil notes there is a sponge rubber gasket that fits over the tower and under the cab plate to form a crude seal on the top of the gearbox.  I bought mine from Brian Asbury NoS a few years ago now.
 
 Pete
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