Hi All,
I tried to fit one similar on my Cap Camarat
I could not get the screw undone so sent it back.
Turns out screws are locked in with a type of lock tight.
Made my own extension pieces and a Bow plate from 3mm 316 Stainless Steel.
Nylon rollers of varying widths and diameters are available from Sea screw
I'll send some photos when I get down to the boat.
Mikey B