Wtb: extended lug bolts - 10 or 15mm longer - any advice

[Gamman]

Looking for longer mag bolts (10-15mm longer) for some kosei's I have just bought which need a spacer. How much are they locally, and what is best price new? Or anyone have 10?

This is what I am thinking of:
http://www.apexraceparts.com/BMW-Ext...lly_p_123.html

Specs
M12x1.5
17mm Hex head
60 degree taper
10.9 Grade
Black or Silver zinc finish
Made in Europe

+10mm or +15mm required.