Tom from SWISCO responded:
June 22, 2016
Thanks for contacting us. It's hard to tell what you have based on your pictures. One of the most important details is the pivot shoe, which is unfortunately obscured by your thumb. It looks like it could be our 15-191, which is commonly used with the Series 160 coil spring. If you also need the other parts for this set, see our 15-148 bumper and 15-150D double coil support.
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