I already have 10k HIDs but now I want to buy projectors, I was wondering if I buy the correct projectors with the right Bulb housing (9007) or something, I can still use my HIDs right?

Only projector headlight made to fit a 9007 is the APC dual projectors, but good luck finding them, they're not as common as the rest, and IMO arent made very well, they don't have a housing on the back like the stock lights and other projectors.
-----------------------------------
97 RS-T, STAR Stage 2, HAHN FMIC, Decah Lambo Doors, 19" Axis Hiros, Built 420a
-----------------------------------

So ur saying that, If I want projectors i cant have Hids..

go to hid planet.com and read up on the forums... Get REAL projectors and do a retrofit, and not some ebay ricer bullshit... some work is involved, but it is worth it in the end.

yea for real do the hid setup rite. and be careful with those 10k hids, they are honestly horrible. They are not going to light up the road as well as a 4300-5k kit, and chances are you will get pulled over for the lights being that deep purple color

do a search for azdave, he has HIDs fit in eBay projectors and I think he has a write up on it either here or on his site.

10k is insane dude. Get some 4100-4300k bulbs if you want to take advantage of what HID offers and do a retrofit.

i used to have H4 HID lights in my projectors. normally they take the 9006 and 9005 bulbs, but with a little bit of ingenuety it fit juuuuuuuuuuust dandy. your bulbs dont have to match the projectors, but it helps