Are you using 10" or 15" tubes?

I'd rather go with a 15" tube ... but I can't check to see if it'll fit b/c my car is going to be @ the body shop until the end of this week & I want to put in my order.

Tkx!

I used 15" blacklights under the dash.

Lol, I got mine at wal mart. 17" and they are fine. $10 a piece! Lets see how long they last!