ddmtuning.com
That's all you need to know...
oh, and this:
http://www.svtperformance.com/forums/interior-exterior-modifications-212/658860-hids.html
...and
this:
$55 HIDs **NOT SPAM** Installed mine last night - 2003-04 Mach 1 Registry Owners Club
I just ordered my set today
DDM Tuning 5000k
yup, slim ballasts for me. hi/lo for the headlights and single beam fogs