With a little creativity, you can create what works best for you at a reasonable cost and get the look you want. In most cases, less is better. Since I have no real dexterity in my hands, twist knobs and the headlight pull knob can be a real challenge without assistance. We used a thick plastic and cut it to shape on a band saw to make both pieces. They can be removed without any damage to the original equipment.
Bolts run through the end pieces to form a clamp.
The van came stock with a six way power seat. I needed the seat to pivot 90 degrees into the van for transferring. There was not a manual pivot on the market. I didn't want to have to be concerned with seat motor failures like I've had in the past. We cut down an after-market swivel base to match the factory height of the seat, built a new base and matched the bolt pattern to the stock holes for securing it.