I thought I'd share with you my source of mirrorized aluminum "W" bent reflectors for shop lights (any length, 2 bulb fixtures). This guy
makes them in his metal shop, sells them to local businesses, but also will do small orders and his shipping is very reasonable.
They are designed for 2 bulb T8 shop lights, but could possibly be used with other size bulbs. He also will definitely do custom ones, but they might be more, then.
He is Amish or Mennonite and honest and a nice guy. I've used his reflectors for years now and they are terrific. I just bought 8 more and they were $8 each for 4 foot fixtures. I've also had him cut them down for me to custom lengths for smaller fixtures. You can do longer fixtures, too, by using different lengths of reflector.
Just thought I'd share, because I looked high and low for a source, and was lucky to find one local to me. I'd love for him to get a bit more business from the hobby.
Below is a picture of one I had him make for me in a shorter length. I cut down a 4 foot shop light to make a canopy for a 20 gallon (it was cheaper to cut down a $10 4 foot shop light than buy an overpriced shorter fixture, go figure - plus, then I used the ballast to 2ODNO the bulbs).