How did you get the C&C solo seat to fit your LO? Looks like the mounting is different (C&C has one mount...LO has two).
Hope the OP doesn't mind me answering a question for him...
If you look at the pictures of the OP's rear fender, you can see a plugged center hole about three or four inches above the double thumb screws that hold the stock seat to the fender. The C&C seat reaches up and back further on the fender and mounts to that single center hole.
LED tail light and swing arm bag are sold. The seat mounts with a T-bar, mounts to the two bolts on the fender then secures to the T-bar. Ghoticov shoot me a reasonable offer and we can work something out!