here it is again with the years of production:
1 .CJ7 Late (1977-85)
2 .CJ5 Early, Version A (1954-62)
3 . CJ5 Early, Version B (1963-69)
4. CJ5 Late, Version B (1978-83)
5. CJ5 Late, Version A (1976-77)
6. M38 (1950-53)
7. CJ6 Early (1955-75)
8. CJ6 Late (1976-81)
It will be very important to note, however, that the CJ7 encountered other changes that making a blanket tub to cover 1976-86 leaves us to have to make many modifications to fit.
1976-early '79 had the roll bar mounted to the sides of the tub, 1980 intro of the Dana 300 and light duty trannies brought the need for a larger transmission tunnel hole to cover the options of SR-4, T-4 and T-5 extended length transmissions, 1981 introduced the "B" pillar behind the door, the mid-'79-on roll bar mounted to the floor in front and wheelhouse in rear makes the rear wheelhouse baffles absolutely necessary (see my yellow circles from pictures). 1976-1977 had the smaller hole in the cowl for the heater system.
On a good note, your "Jeep" stamping on the body sides is 100% correct in font and position. Omix sources its replacement side panels from the Cobra King company and the "Jeep" stamping on those is entirely incorrect in size and font. Why Chrysler granted them the license to sell them like that is beyond me. The panels are also a thinner gauge than your tubs.
There should probably be three versions of CJ-7 tub:
CJ7 Early A: 1976-1977 due to the smaller cowl hole size
CJ7 Early B: 1978-1980 due to larger cowl hole but no B-pillar
CJ7 Late: 1981-1986 due to B pillar, enlarged transmission tunnel hole
Can anyone confirm when the indentations were added to the sides of the cowl below where the windshield hinges connect?