hello, i recently came across a great deal on a RB67 Pro S outfit and would like to add to it. It came with a 220 back with no darkslide, so i would like to obtain a 120 back with a slide to help get things going. But, i would be interested in hearing from members who may have some unused RB67 gear they would like to sell. i would also be interested in 220 film. Thank-you.