You can get the fixtures at Walmart or your local pet store. I know my pet store has some supply of aquarium light fixtures.
When I got my
UVB light, they tried to convince me to use a 24 long fixture which would extend to her basking spot. Allie's
UVB light's on her cool side which is her oasis. They were trying to sell me a Reptiglo 10.0. I was adamant and wanted to listen to what I read about Repti-glo causing eye problems and other health issues. They sold me a UVB coil bulb and an infrared light which I took back and exchanged it for what I wanted. I wanted a Repti-Sun 10.0 in an 18 inch length. I noticed a huge change in Allie. Her body colors are showing and she's much more active.
Don't use coil bulbs. Use tube light.
Don't use Reptiglo.