Ummm...you sure you don't mean width???
Should be between 58 and 61 inches. Here's some info:
Original Vehicles
Rear Suspension Width (Flange to Flange) Year Classic Vehicles Width
26-39 Plymouth-Dodge car/pick up 56-58"
40-52 Plymouth-Dodge car 60-62"
26-39 Chrysler/DeSoto Car 60"
Most Early Mopar's 56-62"
25-39 Chevy Car 56-58"
26-46 Chevy Truck 56-58"
40-48 Chevy Car 58-60"
49-54 Chevy Car 58-60"
47-54 & 55 1st Series Chevy Truck 60-62"
Most Early Buick,Olds, Pontiac 58-61"
28-31 **** Car/Pickup 57 1/2"
32 & 33-34 **** Car/Pickup 56 1/2"
35-48 **** Car 57-60"
35-41 **** Pickup 56-60"
49-58 **** Car 57-58"
49-56 Mercury 57-58"
49-51 Mercury 61"
64 Falcon 58"
67 Cougar 60"
55-59 Chevy Pickup 62"
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