AC Low Pressure / Clutch Cycling Switch, O-Ring?

[me88]

Noticed some leakage that glows under the UV lamp around the AC low pressure switch or "clutch cycling switch" (15144494) on the accumulator in the engine bay. GM manual says to replace the O-ring together with the switch, but does anyone know which part number is the right one: 19188397 or 90381761?

 

[j91z28d1]

most people just buy the assorted kit of the green ac o rings and match it up.


you might have to stop by a gm parts dealer for one specific o'ring