84 TOYOTA 4X4 "U" JOINTS

I JUST BOUGHT AN 84 TOYOTA XTRA CAB 4X4 PICKUP (FOR $325!). I BOUGHT IT FROM A LOCAL MECHANIC THAT HAD A LIEN ON IT, BECAUSE THE LAST OWNER WOULDN'T PAY HIS BILLS. IT IS A 4X4 (SR5), BUT THE FRONT DRIVESHAFT IS DISCONNECTED FROM THE TRUCK. I HAVE THE SHAFT, BUT IT NEEDS NEW U-JOINTS. THE REAR DRIVESHAFT NEEDS ONE REPLACED ALSO. WHAT I NEED TO KNOW, IS WHAT SIZE U-JOINTS DO I NEED?? I WORK FOR A TRUCK ACCESSORY STORE, BUT THIS ISN'T SOMETHING WE USUALLY CARRY, HOWEVER I CAN GET AHOLD OF THE LAKEWOOD BRAND. ANY HELP WOULD BE GREATLY APPRECIATED.