I have two Attwood quick release seat mounts and they say they fit a 7" swivel. I researched and tried three different 7" swivels and came to the conclusion that there are no standard 7" swivels. So in the end I left them, took my grinder and whittled all the crap out of them, to get in and out of a quick release mount. I don't know if it's related to Attwood, the swivel makers, or both. I know all three different brands of 7" swivels I bought were all different sizes! So. All I can say to you is good luck!And maybe avoid some grinder problems.The quality of these levels seems ok.
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