8.25" 3.21 Sure-Grip

The 8.25" F-body housing width flange to flange is 54.34" ('76-'80). Perches are 44.5" center-to-center.

For reference, 8 3/4 housing widths, flange to flange

A BODY (perches 43" c-c)
'66-'72= 52 5/8"

B BODY (perches 44" c-c, except '71-74: 47.5" c-c)
'62-'63= 53 1/4" (And '64 Max Wedge)
'64 = 55 5/8" (Exc. Max Wedge)
'65-'67= 54 1/4"
'68-'70= 54 15/16"
'71-'74= 57 7/8"
'71-'73 wagon= 59 7/16"

C BODY (perches 46" c-c)
'65-'69= 56 3/4"
'70-'71= 57 7/8" (Chrysler & Fury)
'70-'74= 59 7/16" (and '69 wagon)

IMPERIAL (perches 46" c-c)
'65-'66= 57"
'67-'69= 57 3/8"
'70-'71= 54 3/4"
'72-'73= 59 5/8"

E BODY (perches 46" c-c)
'70-'74= 56 31/64"

A100
'65-'70= 56 3/4"

D100
'65-'71= 58 5/16"
'72-'74= 59 7/16"