07 Tundra 4x4 Grease Fittings on Driveshaft

I was trying to grease my driveshafts yesterday afternoon and found one of the grease fittings to be bad. Went to the dealer today to pick one up and they told me they didn't exist. I had M6 and M8 fittings at home, didn't fit. I believe the fitting is an M7 1.0 thread. Toyota tells me the only way to get one is to replace the U-joint, are you kidding me? The truck is under warranty, but what a PITA!