They were around $50 each, They are a Dunlop K70 knock off, I've ran K70's on all my vintage bikes and wanted to try them on the C5 but couldn't find any the right size. No clearence problems.
I found these on sale and thought I'd give them a try, glad I did.
They look right and handle very well. it did take a bit more weight than I like to balance them but nothing horrible, I'm curious as to how long they will last. I gained nearly an inch in needed tire height on front too. I'm running them at 26psi front 28psi rear.