This is the HD unit. For 80's trucks, just swapped my old two piece mounts for this full plate, that actually fits the tall rads. The regular spectra rad fits under just fine, but this plate is meant for a 4 core, I used a 3 core bushing set and got it to work just fine, i had to massage the plate a little for some more clamping force to take up the extra room. I also changed it because I wanted a cover over the rad, since my fan shroud is a little modified, and for when I work on the truck.
70's and 80's wont interchange as far as I know. But you just have to bolt in the new plate and that's it. The aftermarket units are a little flimsy.
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