I got some SS Allen head bolts that are longer than what comes with the riser from McMaster Carr. I used CVG Fir 2x2 and counter sunk them so the bolt and nut would not protrude. I even drilled some drain holes so that water would not collect in the countersunk holes. I painted the wood with Petit Easy Poxy 3108 Off White. It is a good match for C-Dory White. They have held up well, but the front one could use a little touch up paint after 5 or 6 years of use.
I put some photos in our album if you want to look. Album is not very organized. You will find them at the very end of the album.