The 2 steel pipes under/behing oil filter are leaking. seems to be a oil supply and return setup with a manifold that oil filter screws on to,
(1991 945 se turbo)

has anyone done the job? can it be done without removing turbo?
and mainly what parts, seals, gaskets, ect do i need ? to completely reseal
everything on that setup.

You will need two large O rings two smaller aluminum crush washers and one large aluminum crush washer. It can't be more than $10.00 in parts.
Yes, you can do it without pulling the turbo. There are a couple of sort of special tools that will make the job go easier, the large socket for the monster banjo bolt that goes through the adapter housing and into the block and a 1/2" universal joint to go on it. Also, when you pull the nut off that goes onto the same shaft that you thread the oil filter on if you have an easy-out that fits into the end of that threaded shaft you can pull the shaft and it makes the job much easier to do.

Mark