A/C Question W123 - 1985 Mercedes 300D

[marco5]

Hey guys,

I'm installing my A/C compressor and the kit comes with 3 orings. I was just wondering which one's I should use for input/output? Also why is there 3? Sorry for the noob question. This is a Spectra Premium A/C Compressor (reman R4) and a below screenshot is of the 3 orings and the compressor itself.

I saw the following for another brand for A/C compressor, however I'm not sure if it's for mine as well and I don't understand it. "GM Radial R-4 version Compressors having stepped ports require the the following seals be installed in the following manner : The large brass seal is only for the suction port. The green seal is to be used on the discharge port. The short(er) of the two sleeves is to be used in conjunction with the green seal. This centers the seal, which is essential to prevent leakage. The two other seals in the kit are not applicable for Mercedes. These seals will only be used in compressors having a stepped port configuration. See 24 342"

Thanks,

Marco