This weekend I'll be converting my 87 300D from R134a back to R12. While double checking all of the items that I'll need, I noticed that the new expansion valve I ordered has a R134a label on it. Isn't a different valve used for each refridgerant? I can't seem to find part numbers for different valves for R12/R134a. Any advice from the A/C gurus would be appreciated.

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1987 300D Turbo
2000 VW Golf TDI
2008 E320 Bluetec