Rota Grid Drift 9.5J et 30 on a 5

Searched all over the internet but cannot find the answers to a few questions regarding these wheels. Help would be appreciated.

What size extended studs will I need for the 10mm spacers up front?

Found these on fleabay.

http://www.ebay.co.uk/itm/370476960905?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

I can only find Eibach hubcentric in stock in the UK but it states they are for a VII. Cant find any labled as for a 4, 5, or 6. Are the hubs the same size?

Lastly will i need open ended nuts or will the spacers take up enough of the thread to use the nuts supplied with the wheels.

Thanks