Hey guys I'm looking to pick up an r100 seat and install it on the passenger side. My question is what is needed to mount. Is it just the base and then the rails off the old seat or do I need to purchase anything else? Will I need to modify anything ? Thanks in advance.

 

It is going to be higher than the driver seat.

You are going to want to use the factory base and slider and then make your own mount to get the seat as low as possible. You can make the mounts from steel bar stock from Home Depot.