I'm thinking of adding a rear butt seat.I would appreciate any help in selecting one.I'm think something like a swivl eze.Any to look for or avoide?What is the standard height for a butt seat.

Thanks

Height will depend on your height....I have only found 2 different lengths....they were both had a range of adjustment.....I'm short so I got the one with the shortest starting length.

 I bought a Springfield with an adjustable seat height.  It was great at first, then became less than great.  The thing wobbles and the seat freely spins. 

I have used the hydraulic adjustable post for years. It seems they are only good for about a two year period before they slop out and are useless. This last one I bought is manually adjustable. No more hydraulic piston to wear out. I believe this manual post will last much longer. It also sells for a much better price.