'29 CCPU seat shopping - what do I need?

[Nathan_1929]

I'm in the market for a seat for my 1929 Closed Cab Pickup. This is what I'm working with.

I want to stay stock, so no minivan or S-10 or anything else. I've mentally swallowed the pill for the cost of a new complete seat from one of the current suppliers but I don't know what other mounting hardware I'm missing here and have no local reference to check. So what am I missing?

(I would also be in the market for any of the above if tall y'all have this for sale near St Louis, MO.)