They have the same size hole in the cab.... It is the neck sizes that are different. The 67-70 use the 2" fill neck hole grommet and the 71-72 use the 1 1/2" hole. WES www.ClassicHeartbeat.com
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72 BB Chevy Custom Deluxe / Custom Camper
67 I-6 (Soon to be 5.7 LS1) Panel
68 BB Chevy Short Bed
72 6.0 LQ9 Short Bed Chevy 4X4
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