[Help] Real dimensions of the racing seats

Resurfacing this thread. Does anybody know how to determine what size seat you have? Is it just by measuring as described in this thread? I was able to match the large measurements done by tobewiser, but curious what the medium size dimensions are. Of course if there’s an easy way to determine the factory size, please advise!

 

Just get the large then.

Mike

 

I understand that there's but 10mm difference between each size. So a large is just 20mm wider than a small. Most everyone gets large.

 

I drove F8 yesterday medium race seat was tight on my back ok on my rear got back to dealer sat in large race seats F8 seemed more comfortable to me all over.
I'm 6 feet 183lbs.