Replying to OWNERS OF ROSSI FKS 155 RACE

I need your help.

So i went to my local shop today to get my bindings mounted up to my joystick these. Immediately when i gave them the binding they were puzzled about them and didnt know how they would mount them to the ski (ammatures). I asked what was wrong and they said some thing about a jig and also they said the bindings needed a base plate which i was very skeptical about because ive never seen an fks with a plate under. She told me that they would do some research and if they didnt find anything then they would send me away. I never thought it would be that difficult to mount up some bindings unless the people just have no clue what theyre doing. I have all the screws for the bindings. My question is am i missing a piece and are the 155s the same as the newer 140s?