just look up a small machine shop in your area. That piece is about an hours work on a manual mill (knee mill). Guessing you'll ge charged about 50-60 bucks. I'm a machinist and we generally go $60/hour for manual machines and $80/hour for cnc. One thing to keep the cost down if you did go to a shop is don't make them reverse engineer everything... make your own drawing. Grab your calipers, take measurements, and make a simple 3rd angle projection dwg (meaning draw it from all the sides so you can dimension everything that you need to) and take that to the shop and say just use some 2024 or 7075 alum laying around. If you're not going to get it plated use 6061 b/c it resists corrosion the best and all he other parts on your truck don't appear to be anodized, powdercoated, gold alodine (which would look sweet!) but 6061 doesn't cut or finish as pretty and its gummy and soft. Trust me, for the last 4 years about 80% of my work on turning and milling have been aluminum. If anyone needs advice on alum and how they hold up, plate, resist, cut, properties, let me know. Also, use some socket head cap screws instead. They don't need to sit flush it appears and that way you could get an allen wrench on those suckers alot easier than a screwdriver.. at least thats the way it looks. Man this got long.. just felt like dropping some machine knowledge!