I have been in contact with Charlie from DeepSeat and all is well with them. I can get the seats($250) and collars($55) and vests($120).
If you are interested in anything email me. I will be putting them back on the web site but if you get them from me at the track these prices will inc tax.

Seats size chart

SIZES-----CHEST-------WEIGHT

13-1/2-------------------150 - 170
14------------36"--------165 - 185
14-1/2-----38"-39"------170 - 190
15----------40"-41"------175 - 205
15-1/2-----42"-43"------205 - 220
16----------44"-46"------220 - 240
16-1/2-------46" ++-------240->