http://www.amazon.com/Hella-90mm-Hea...+low+beam+90mm
They look different due to being low/high beam. The connections are likely different as Hella's are H9 and I don't remember what the firebolt bulb type is. Not that big a deal really.
No need for hacking up the harness as "standard" headlight bulbs are all ~45-55W - doesn't matter what type of bulb socket.
Also - a bi-halogen (low and high in one) - http://www.amazon.com/HELLA-00999802...Y5J5DTJEG8KZVN