what is 4 " hubs in metric

1"=25.4mm

what you reackon drill the wheels bigger or wobble nuts?

13 inch revolotions from a manta to a viva

ahh i have slot mags of a mini they fit my marina but wont fit the viva

i was told they were of a mini tryed them on my marina and they fitted

but i have already bought the revoloutions and they are going on the viva just gotta figure out how

Well that was kind of the point I was trying to make.
Put the manta ones on eBay and rape the "4x100" WC VW tax.
Then get some Mini ones and pop them on the Viva.
Seems like a much more sensible route than trying to get a square peg in a round hole.

You can & could get 8x13's that would bolt straight on right PCD & killer offset, but I rather suspect you have made up your mind and will bodge these ones on no matter what. Personally, if there is a logical & safe way to get a best result, that's the route to go.
Just don't come crying to me when your wheel overtakes you at 70mph.

MartinC says 4x100 pcd. vivas are 4x101.6 (4x4").

i wouldnt bother trying to fit the revos from your manta to your viva. you can buy the correct ones here:
www.midlandwheels.com/kolist/1/Alloy%20Wheels/Mws/Revolite/Revolite-13

i would do it properly, if it was some rare wheel that was the wrong pcd but would look super awesome then yea, re drill your hubs, fit adapaters, wobble bolts etc, but for a revo, just buy the right ones!

your marina is a different PCD again, the wheels from that wont fit your viva either.

that Viva just needs some altitude adjustment and its purfect.

I wouldn't mess with GMs and the 1.6mm difference - I've doe it and knacked a wheel stud. I know people who have done same. Maybe some marques you can do it but for sure on the Vauxhalls and Morris Minors 4" is 4" and not 100mm...