All those springs will fit on the 450SL. Note the 450 spring that I highlighted is from a 450SLC, which is heavier than the 450SL. I had to use the 450SLC springs on my 560SL to return the car to normal ride height after putting in the M120 V12. The combination M120 V12 and 722.6 trans weighs about 200Lb more than the M117 and 722.3 combination. This is why I have those 560SL springs available. I would assume that the 450SL springs are somewhere in between the 560SL and 450SLC. Unfortunately my EPC is down so I cannot look up the part number of 450SL springs.
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