they are green high pressure type just need to measure them . can also use a dab of wellseal on the union for insurance ie will never leak and helps lubricate the o-ring in to place
270Pcs Air Conditioning Assortment O-Rings Seal Ring Air Con for Car Green Hot! | eBay
Nitrile Rubber (NBR), 270pcs, 18 popular sizes. 1 X 270Pcs 18 Sizes O-ring Kit. Hydrogenated Nitrile Butadiene (HNBR), also known as Highly Saturated Nitrile (HSN) is a special class of nitrile rubber (NBR) and is for mission critical applications.