E30's are equipped with r12 fittings. When r134 was mandated, so were a whole new fitting system. When you see r134 ports in an e30, it's usually because someone bought a "r134 conversion kit" which is just the two adapters and r134 gas. If you are converting, you will need the adapters - and really should update the system since r134 in a r12 system, they never get as cold. There's a great thread on here for truly converting to r134...
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E30 A/C Service Valves
I am working on putting the AC all back together in my 89 E30. Someone had completely removed it some point in its life. One thing I could not find information on was the service valves. I see these Replaceable service valves that seem to go on the suction lines but it doesn’t look like the suction lines in my car would accept these. The replaceable ones:
And the ports on my lines. 
I just want to make sure that the ports on my lines look correct and I’m not missing anything. I don’t know if there are several variations and the service valves on my lines are fixed?
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