95Road King,
I found a Weaver base that will fit your 686. It has the three screws, is blue and of no use to me. The only draw back is that it is for a factory drilled and tapped gun. However, if your gun has not been drilled and tapped then it should not be a problem. I bought it for my model 57, but since it is D&T for a Redfield mount, the mounting holes do not line up. Let me know if it will help you out.
Rick