The factory low side and the high side are the same. You can get the correct adapter for the high side from most any parts store. You may have to buy both the high and low in a kit. Some adapters have a piece in the adapter that looks like a valve but is only a rod to push the original valve. Just think, before they came out with R134, ALL a/c systems used the same fittings. One set of gauges was all you needed. Now you never know what you need.

Good luck,
Paul

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84 500 SEL (307,xxx miles)