4 bolt, so you'd be looking at drilling some new holes in your bass.
To get properly intonated, I needed to move the G string saddle out farther than the original screw would reach. I called Hipshot and they had a lil envelope full of various length screws sent to me in just a few days. Was a great customer experience. Those extra screws come along with the bridge, so shouldn't have even a little trouble intonating your strings!
Not interested in buying your black bridge, but if you want, you can have first dibs on this chrome one of mine when I put the thread up!
I'm good man... I want the chrome for a custom ordered bass that wasn't cheap... I'd rather pay full price for a bridge than have more holes drilled. Thanks though.