This is quite a stupid question but i need your guys advice before moving on!

How would i go about sourcing longer wheel studs for my Sunny? I need about 10mm more as the spacers wont allow for the stock ones to be used (run out of thread) and someone said in another post that Bluebird ones were longer..

Now im guessing i just cant ask the wreckers to go get me some and they wont let me go get it unless ill have to buy the whole rear end or axels, so can i use just standard old longer bolts and bang them in/weld somehow?
Or does there need to be the fine thread on the actual stud like there already is?

Oh and has anyone had any experience with having their springs heaten up and re tensioned/positioned at a different ride height? Im most probably going to do this to my springs for a lower ride (2" maybe or less)

Cheers
Dave