If you're looking to buy OEM, Ron Ayers.
. Use the Parts look-up.
The Thumper Talk store has OEM and aftermarket.
I've also bought aftermarket stuff from Jake Wilson.
Or Alan, aka AB13, can probably fix you up.
I got a cig lighter socket from Ace Hardware. It had alligator clips on it that I cut off, added wire to it, and wired it to the battery. Put an in-line fuse in the wire if you do this.