Vertical post roller for trailer, cannot find anywhere!

All, I have been looking everywhere to find a vertical post roller guide, that can be mounted to my trailer on the inside of the hulls. I have seen these on other trailers so I know they exist, and they are so simple, but I have scoured the web and cannot find them anywhere.

I hope I am adequately describing what I am looking for. Basically, it is just a straight vertical post that mounts to the frame with u bolts, and then it has a horizontal roller at the top of the post that would contact the inside of the hull.

Any help finding this would be much appreciated. I have looked everywhere.

Thanks !!!

I've found catamaran trailer parts at the trailer parts depot http://www.trailerpartsdepot.com/items.asp?Cc=APONT-CR

They have roller brackets with up-right guides.

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John Latimer
'79 Hobie18 - Magnum
Sail#4854

If I remember correctly, those things are really expensive! If you or someone you know is a decent at welding, have them add a guide like this. Just metal stock welded at an angle to the existing bracket. Then just put a pool noodle on it.

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Zach