I am not sure what a flat blade bulb is. In any case I have a recommendation. I initially replaced my automotive tungsten bulbs with equivalent LED bulbs. A couple of the fixtures were fluorescent so I had to replace the fixtures. Now I have found fixtures/lights that I like even better.
I bought a single and a double Gold Star fixture from Amazon. The double is really bright so I doubt I will ever use both at the same time. I liked the single and ordered a set of 3 more for a total of $15 delivered. I will warn you that the diffuser does not work perfectly and casts some small shadowy lines. Especially for the quality and price, I find that acceptable and not something I notice after the initial inspection.