So mine bolts directly to the floor. I guess this is OK?!
Glenn - It's OK if that's the choice you make. Since you don't have the original support pedestal (nor the original seat frame and bottom/back sections from what can be seen here) at least there's nothing in the way of installing that seat. Before you do though, I'd suggest some test fitting just to see first of it actually fits and where the base legs land as you will need more than a single layer of sheet metal to secure it to the floor pan (for safety considerations).
Another thing to consider is that's just the seat bottom. How is the seat back attached/supported as an original seat had a rigid tubular frame that supported both the bottom and backrest sections. Some trial fitting to get an idea of how things will go together is in order I think. At least concerning the seat.
