I'm not 100% sure if the forward clip on the Gen 1 trucks have a provision for both set ups from factory. You may need to take off the headlight mounting panel from the dual 4x6" front end and cobble it onto the single headlight. Then you'll need to change the headlight wiring to split the low and high beam (not a biggie but you could use semi sealed H4 halogens and have the full deal of dual low and high beams)