Do i need to buy new 'brackets' for a new bumper?

[oldblue1968chevy]

Im in the process of ordering some new bumpers for my truck, do i need to buy new 'bolts/brackets etc, or can i use the ones that're already on it, im aiming to get on without a place to mount the ball...just a chrome smooth lookin bumper for the back, and a chrome one to match in the front. NO LIGHTS on either of em..but do i need to buy the brackets for em..id rather not order them, but would hate to order them wait 3 weeks and then not be able to put them on lol...thanks to anybody who can answer my ? and understand what im trying to say lol