I'd stick with the narrow seats or similar and mount them as low as possible rather than going for the bigger bases.
The reason is you'll end up with your head and upper body sticking up into the air flow above the wind deflector if you have the wide ones high enough to clear the chassis rails. That's not only bad for the aerodynamics, but it's also very uncomfortable and you'll look like Noddy tootling through Toytown.
Ideally, when seated you need your shoulders to be level with or no more than a couple of inches above the cockpit edge.
Ultimately it's your choice and it's nice to see your build progressing.
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