Not real sure what you mean, A wedge can be made out of wood, just cut up some 2x4 into wedges, but as for a anchor I would check out Home Depot or Lowes in the Hardware dept. for anchors, they have alot of them.
I think I know what Froggy is looking for, I would call it a cleat not an anchor. A angled board mounted to the wall with the top angled into the wall, then a matching piece is placed on the thing you want to mount and you hang your cabinet or headboard on the cleat.
I'd think you would make them using a table saw to cut the angle on the edge of a 1x3 or 1x4. Or take a 1x6 and run it through a table saw and get both pieces out of this one piece of wood by setting the blade at 45 degrees and cutting it lengthwise down the middle.
You might be able to find them in the kitchen cabinet section of the home center or at a kitchen and bath retailer.
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