I like it also!
A forum member told me about his 4R grill swap:
"Hey mate the grille is off a first gen pickup, the only thing I had to do to make it fit was swap the headlight surrounds for the later 86-89 4runner, as they are shorter. you can use the earlier ones if you trim them down however i didn't like the look of them trimmed. Also all the mounting points don't line up so I just used cable ties on the two outer top holes, and drilled a self tapper into the bottom middle hole. It holds solid enough!"
I hope this helps.
If you do it, please, document it.