B2200 Single Cab Cap?

I have a 1992 single cab b2200 and was wondering does anyone make a flush side cap (dont know what they are called) instead of a side cap with slots?

I don't know whose truck this is but the black side cap

Those are factory. The slots are a vent. I'm pretty sure they relieve pressure when you shut the door with the windows up, or it's for the cab ventilation. If you want them gone you'll have to fill them.

I knew they were factory, but are the slots or vents really necessary?

Some of the guys have filled them. I doubt there'd be any issue doing so.

Filling them shouldn't create a problem. Might make shutting the doors harder with the windows up. But I don't think theses trucks are going to be all that air tight now anyway.

Grant Kustoms use to make filler plates for them if you hit him up im sure he will make you a set