Looks like they are out of stock for the 3500, as indicated above looks like a replace.
These are the type we have. I would recommend auto.
http://www.cabelas.com/product/Cabel...FD/2199462.uts
I also see they they are listing a new 4000 series.
http://www.cabelas.com/product/CABEL...1.uts?slotId=0