What type of fluid for a 69 convertible top pump?

Hi all I'm in the process of putting my 69 barracuda convertible back together and just changed out the hoses for the top pump the fluid that drained out smelled like hydraulic oil so is that what I'm supposed to use to refill the system or do i use trans oil? Any help will be deeply appreciated.
Thanks
Pat Faley
67 NB
69 Barracuda convertible
East Peoria, IL