hobie fish finder mount for elite 4?

[lowprofile]

went to oceanside dive and kayak to get a rail mount for the fish finder. guy there picked up two packets and said this is what i needed.

so i get home, get it together and go to put on my fish finder and whats this....



it doesn't fit...

it was now 4:45 and they close at 5... so no going back.

is there another plate i add to it or is it just the wrong plate?

btw, it was fine with one bolt while hooping tonight.



oh, and when they did the initial install on my X factor they didn't give me back my box or any of the extra mounting hardware that came with it. so now I don't have any of those parts if i wanted to install the transducer on the rear.