Lowering stock NC seat
Having enough head room when wearing a helmet has been a problem in all my MX-5 including the NA and MSM. I partially solved it by removing foam from the stock seats but the real fix was a Sparco Sprint bucket seat on custom rails bolted directly on the floor.
I came over some posts on miata.net where people lowered the rear bracket on the stock NC seat mounts to gain as much as 6-8 cm when fully retracted. After looking at my own drivers seat I can confirm that the stock rails are practically monted 5cm above the floor.
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Rear mount can be removed by drilling out a rivet which took ages + a little spot weld.
You also need to shorten the rail about 7-10mm depending on the thickness of the new mounts.
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I used some 90 deg angeled plates that I modded to something like this. These work like an inverted stock mount and lowers the rail to be flush with the floor and the rear threaded bolt hole.
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For some reason I didn’t take a pic of the finished product but here is the result with the passanger seat in the same position for reference. This is a worthy upgrade for tall people.
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