Don't know what car you have, but it will not fit on many MBs. If it is two separate compressors, in other words two separate threaded rods with hooks on each end, then I think they are unsafe on any spring. They have a tendency to slip around next to each other resulting in a banana shaped spring that looks like it wants to escape. Then you have to gingerly release the tension on the screws, reset them, retighten them, and hope they don't slip around again while you handle the spring.

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1987 W201 190D