i want to buy an rear seat for my 05 eiger but i need to know if they are universal or do i need to buy one that is made Specially for my bike

 

I would look for a seat that is built for your machine.

 

Do you mean a storage box with a seat? If so they are universal I have the Kimpex Deluxe model I just bolted it down to the rack with the 4 U bolts that came with it. I put some foam pipe insulation (stuff you put on copper tube water lines) on the rack first to keep the box snug and prevent it from rubbing the paint off causing rust. I know people with Eigers that have installed the same seat.

My Pic's

 

thats what i meant thanks vinny