Most Sanden heads have a letter in the center of the back, NOT THE SUC / DIS or S / D under the fittings, the letter(s) are in the center of the back. These letters can be used to identify the head as well. Please email us the letter if we do not have it listed, we stock every available Sanden head.
This back is great for converting a GM compressor to a Sanden style compressor.
This is a QD head.