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A vang could be a simple strop to limit excessive boom lift going downwind, all the way to a rigid boom-supporting device that costs several hundred dollars.
Whichever system you choose, the most important point is to have something in place. For your boat even a simple 4 part tackle run to a cam cleat at the aft end of the cabin will do the trick.
As SD indicated, Gerhaur will have the necessary parts, as will Harken, Lewmar, Schaeffer and others. The Harken catalogue is a good guide to what type of blocks you'll need even if you choose to use someone else's stuff.
Even on a small boat the loads on a vang can be fairly high so don't skimp on the fittings on the mast and boom.. again, check around for what's available.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)