Hey I am replacing the ballast in my 05 CTS and I am wondering if I can find a more affordable (off brand) ballast to get thru until my next bonus but I see many variations that fit and work with D1S hid lights it is ALL stock and want to keep it that way as much as possible so does anyone know if there are any cheaper ballasts on amazon and how many pins does the 05 cts connecter have on the stock ballast?