I just won a like-new UE Lightning Chassis for $416!!!

[Chadworkz]

You can run the 8mm CVDs in the 15mm knuckles with the use of 8x15x5 bearings. They are a little bit difficult to find, but they are out there...and you can run them until you find a set of 16mm knuckles. Or, some people have successfully milled the knuckles to 16mm, so if you have a local machine shop, you could go that route. Maybe Mike might do it for you, as I am sure he can do it right.