There should be flats on the raised bolt 'head'. Use the correct sized open end wrench and twist/rotate the bolt, both directions. Liberal application of penetrant and careful use of a pry bar. It will come out. Don't forget to remove the nut on the backside.
@aztoyman that's the rear...
Complete sheet metal. I think the grill is all one piece. Stand by, BRB...yeah one piece.
Those corner light do look like they might be the same as mine after I went out to look.
Lights, probably not. truck currently has a '85Xcab body on a 80 short bed frame. Cut 11 inches off front of bed to get things to line up and fit. GM 4.3l V6, R150, marlin dual case.
79/80 was a 20R. Along with L43 trans and 4.37 gears. 22R started in 81 with 3.90 gears, changed to 4.11 around mid year because the 3.90s we're cutting it. 79/80, L43 4th gear 1:1 at 3100rpm equaled 55MPH with stock H78/15 tires.
Oil sender to dash light is like bottom pic in post #9...
The sender is covered with a rubber cap. That's where you see the wire peeking out from. Just peel off the cover, no need to remove sender. Splice wire, have fun.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p4432023.m570.l1313&_nkw=82+toyota+pick+up+valance&_sacat=0
took me longer to find the bookmark than get and post results