Lam they are vespa runners (px i think?) You have to have the outside runners first as you then use them as the template when making the curve at the back of the runner. That way the curve and the runner are the same. Nearly nmade the schoolboy error of shaping them first...Sean put me right and saved me bacon...

I brought rally ytpe ones as the end caps are an older style and similar to lambretta end caps. I think the outside ones of both types have the same curve but you will have to check that...
sef