If it's not listed, it won't fit. I don't remember all the details, but I know they went from post mount to something else and then to the late type. Significant difference.
IIRC Hell Creek has lift kits for these earlier models. http://www.hellcreeksuspensions.com/
<edit> Here's your info. Apparently the fronts are the same as '76 up, but the rears are like '62-73. http://www.ifsja.org/forums/vb/showthread.php?t=66430
1) '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps. 2) '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport 2000cc 2D