1978 V20 Cuddy Seat Dimension?

Hello,
* * I am looking for the seat dimension for a stock '78 *V20 lounge seat. *All the ones for sale have only a 10" base with a total height to the top of the seat of 28" . *This seems a little low but I have nothing to compare it to. *Any help would be appreciated as I no longer have the stock seat to compare to.

Thanks