About the tailight plate holder, the old lucas style tailight assembly is forged with the license plate bracket included and mounts with three screws/nuts (one high you can see and two low hid by the license plate). I found it on eBay for around $35. Just do a search for "lucas tailight" and get the one with the wider license bracket if that's what you're after. The one I got was cast aluminum and reminded me of the tailights on the old brit bikes I used to ride as a kid.
