I used a Bestop Trailmax II seat. The bottom is 40" across and the back is 42". It is wide enough for three kids.
I wouldn't waste your money on the one from CCOT as it is the exact same seat but they add a support leg.
Here's the seat for $279 with free shipping.
http://www.summitracing.com/parts/bst-39435-01/overview/
I wouldn't waste your money on the one from CCOT as it is the exact same seat but they add a support leg.
Here's the seat for $279 with free shipping.
http://www.summitracing.com/parts/bst-39435-01/overview/