A,
I believe that your new pump comes with unions that you just screw on... I would take one of the unions to your local big box store and have the plumbing guy show you what adapters you need.
Keep in mind you will need one for the input as well as the output.. Assuming the input and output pipe size is the same.. it is hard to tell in the picture.
Unless you are incredibly lucky the inputs and outputs of your old pump and new pump are not going to line up, so you will have to modify the plumbing so that your new pump fits.
Thanks for posting,
Jim R.