Need info about shocks for a 4 inch suspension lift on my 1989 jeep wrangler?

On I need to know if anyone can tell a part number or give me any website I can go to to find out what size shoks I need for my lift. I bought the lift off of a subject so there is no paperwork with the lift and he is no longer around for me to ask. I have tried several parts stores but they dont want to send the time to help me look it up. Any hel would be appreciated.