As for the extended studs........you can get them on Ebay for about $25 a set shipped.
Add $4 for a tube of blue Loctite to "glue" the stud to your existing stud, and you would be all set.
I just bought a set of the 4" and they work great. Rode up and down some pretty savage rocky trails and really worked 'em over. No issues whatsoever.
They are actually rated at a higher strength than the existing stock studs, so if anything breaks, it is most likely to be at the stock side vs. the extender side.
Just throwing it out there.