slightly larger then 6 inches or so.
55 watt bulbs, so you CAN use them on highways in conjunction with your high beams (obviously kill them for oncoming traffic)
The install isnt too hard on most vehicles... however with the type of bumper the compass has, it might require some reenforcing or possibly some brackets. The hellas, and most lights of its type install with a single big bolt.
Some of the new hella FF series have the option of single bolt or two self tapping screws, which would work correctly on the plastic bumper of the compass.
Narrow down what you're looking for, and i'll tell you where, how, and what.
Are you looking for long range driving bulbs to assist your high beams on the highway, short range to supplement your low beams in the city, you going for looks over functionality, you want small, big, what?
And back to that blue compass rallye, that is seriously the first compass i've seen that i've actually liked... no offense to the compass owners, but i cant stand the front design.
Installing HID's in stock housings is bad. Here is why.
"When you see someone who needs help, help them. When you see someone who needs a hug, hug them... Help those who can't help themselves." -Sgt Andrew Tingwall, NMSP. End of watch 6-10-2009