A/C Conversion R12 to R134a

[apstguy]

I finally am picking up parts for my conversion today. Got the regrigerant and a pressure gauge form Target (of all places!). I went to the parts places to get the o-rings, orifice tube, accumulator, and high pressure switch. The automatons at the parts place said the don't even carry o-rings for these anymore. They still can get the accumulator. The orifice tube and high pressure switch has to be an r134a, but since it is not original to the truck I might as well have been speaking greek. Can anyone help me locate these parts? I lost the link to the site I was going to use for the parts. Thanks guys! I want this done before it gets >95 degrees.