[FireSale]

Wow. Just a covered aluminum seat is $265 and you need two matching ones for Stock.
Here are some Kirkey prices from Summit.

Kirkey 16 Series cover 125 each

Kirkey 16 Series seat 150 each
Kirkey brackets 54 or 70 per pair
Kirkey back brace 45 each
With the extra cost of the harness, I guess it's a wash...