The AC adapter I have from RS is (Enercell) 273-355 (what Lou showed link to) with tip "C" They put the tip on for me and where it says "tip" on the end of the AC plug, it's plugged in with "+" where it says tip.
I have a DC adapter for the car (same tip "C") - I don't have the model number handy, but worst case scenario, carry your 106 into RS with you. They'll set you up.