Long enough to extend thru. No new collar included. I had ones around that threaded on. Rear nut comes with switch but no front nut.

Thank you for your help, 1 more question how long timewise from order to delivery to you?

Less than a week.

I ordered mine today. I bought the 10amp I needed and a spare for all 3 sizes they use in the dash 5/10/15 amp. I'll keep you posted when they get here.
Thanks for the help.

Yes, please post your experience as well.

Well the switches arrived took 15 days from actual order to my door. What a hassle to get the funds transfer via credit/debit card.
I cannot find any knurled nuts (or any nuts for that manner) that fit.
WHAT SIZE ARE THEY PLEASE, thread wise.
I have searched the lamp section and bolt/nut section of the local hardware stores to no avail. Any help would be appreciated.