sliding/adjustable bevel metal for rocker templater

Looking for sliding bevel material for a rocker profiler/templater I’m trying to fab up next month. Prefer metal over wood for that portion of the jig. Any thoughts where to purchase this stuff online?

I guess they’re called rocker bars. My bad on the terminology. BarrySnyder makes a set, really nice if you have the scratch: http://www.swaylocks.com/surfshop/ad/adjustable-rocker-bars-sale

Think if you have 2 of these it would produce a smoother hot wire cut?

$4.29@ Woodcraft

http://www.woodcraft.com/product/2021274/31495/stanley-universal-friction-lid-support.aspx

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Stanley Lid Support 7-1/2" 80-1525

$4.39@ Hardwaresource

http://www.hardwaresource.com/hinges/SPECIALTY+HINGES/Chest+Hinges+-+Box+Hinges+-+Lid+Supports/Toy+Box+Lid+Supports/7-1|2"+Lid+Support

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Thanks, Oneula.