You don't really need any special long nuts, if you need to extend it longer. Just add another nut or 2 to get what you need. A tiny drop of loc-tite on the bolt where the nut will seat and be tightened against the previous nut will insure it to not come loose.
Good deal on getting the sweeps you were looking for.. 
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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