there are clips on the grill that go into the body panel.
For the lights there are square plastic blocks which go in the fender and you use screws to bolt the light to it.
I'd suggest to buy them from toyota, or buy one of each then go to napa to get alot of them, they are the same ones that are used for the rear tail lights.

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim