I think 360 degree would be the way to go for a bartop so you don't have the force of someone pushing the wheel against the stops.
Generic Eric had a cheap little wheel bought off ebay where you just strapped a mouse to the steering shaft.
You may want to see what pedals you find to use before deciding on a connector.
Sometimes you can find orphaned pedals that were part of a pc wheel combo cheap.
The old logitech ones use a telephone jack (whatever that's called).
The newer ones use a serial port jack (whatever that's called).
You'd have to buy an A-Pac to interface the pedals though.
There were a few old arcade pedals that were optical.
That could be hacked into the other axis of the mouse hack or a basic Opti-Wiz is only $15.
If it is going to sit on an actual bar, having pedals might be awkward.

Just a heads up......driving setups aren't like joystick setups where you can drop in a bunch of roms and have thousands of games to play instantly.
Every game needs to have the sensetivity set individually to play correctly.
Some games will need to have the pedals inverted, some won't.
This won't be something you can make cheap and fast to sell.
Just my $.02