Old DBS and the Vanquish could be had as a two seater and if you ticked the carbon back seats then I believe it could only be had as a two seater.
Correct and with the carbon seats you also lose the heated seats which means you get a unique centre console and have no electric lumbar support so you get a unique seat switch pack. Also they were not available on the Volante (though you could still spec the 2+0 option on Volante with the standard sports seats). Confused? Just know the 2+0 configuration on Vanquish is very rare to find (but more practical and useful for just storage) and the Lightweight Seat option rarer still and Coupe only (as far as I know only 9 cars were built with carbon buckets in both 6-speed and 8-speed variants and none in the S or Ultimate variants for which I have also never seen a 2+0 version).
Seat Type:
Standard Sports (*) 2+0 or 2+2 configuration
Lightweight (1,6,7,8) 2+0 only
(*)Standard
(1.) Not available on Volante.
(6.) Not available in all markets.
(7.) Not available with 2+2 seating.
(8.) Does not include side airbag and seat heating feature, no ventilated seat option.
There is supposed to be an Easy Entry button to aid access to the rear storage area when lightweights are fitted but Aston never bothered to fit it