Ah, found it. The Sparco Seat Dimension Guide has the following specs:
Bottom Mount = 271x345(mm) calculated - 10.67" x 13.58"
Height = 930(mm) 36.61"
As has been mentioned, Sparco on a Wedge - drilling will be necessary - but which bolt pattern would you get from Wedge? Does it even matter if you have to drill anyway?