Also this is the first seat cover I have ever installed and I feel I did a pretty darn good job, but not exactly perfect...
I ended up having to soften the entire seat base in front of the fire place, for a few hours, before my electric stapler would shoot fastners into it. I also re enforced the base with 1/4 inch ply on the foam side and west system fibreglass resin. I sank in some 3/8's SS nuts into the ply/glass for mounting, this turned out great, the seat is not going anywhere now... I actually can't believe I was going nearly 100mph sitting on a seat with a broken seat pan, It could have ripped off at any time with very little force!
Either way this base cost 200$ ish, depending on your location shipping may change the price a bit! I was quoted 300 plus to have it re done professionally with the quilted design, so I am happy... Not really something I loved spending that many bucks on, but the end result is a nicer seat!