i think jonboy is refering to alloy that are called multistud, they have both 4 x 100 AND 4 x 114 (8 holes in total)
if so then yes you can use wobbly bolts with the four holes set at 4 x 100 pcd
as for length
hubs = 12mm thickness
discs = 7mm thickness
Standard alloys non taper section = 10mm
The standard bolts are 29mm thread length.
i have 15mm spacers (used to increase my offset)
12 + 7 + 15 + 10 = 45, so i use 45mm thread length
you just needs to find out how thick the non tapered part in the alloys are, and you can calculate your required thread length
(BTW some sellers advertise total bolt length, not thread length, so be carefull
)
Ninja