I'm after a full set of 16x6 porsche teledials off a 928. Does anyone know of anyone with some? any help would be appreciated.

Ask 555bug on this forum.

I know he has some, not sure about the sizes though.

i,ve got 1 of his here at custom if you want to have a look

I have two pairs of some 15x7 & 15x6 that i might be selling soon.

will 15x7 fit on a 58 beetle or are they too big?

Aside from redrilling or adaptor plates,it would depend on the offset of the wheel.
Which is how far the mating surface of the wheel sits on the hub to how far it will stick out.
ie,they are not to big in theory,you just have to hold the wheel against the drum to see where they will sit.
From there you can see what goes on.
I run a 145 front with a 215 tyre rear on my "ratter" and all is good.