What is this transformer, is it package only without coil or complete transformer?
You have got part numbers for a bobbin and a core , you need to add your own wire,
Does web bench provide an inductance value? you have a turns ratio of 5:2 listed.
This the bobbin data sheet  https://www.we-online.com/catalog/datasheet/070-4477.pdf
Wurth do have some pre-manufactured transformers , e.g. from here https://www.we-online.com/catalog/en/cm/pcd/mid_power_magnetics/
drill down to here https://www.we-online.com/catalog/en/MID-IBTI/#750312547.
Mouser or Digikey probably have a transformer that might work, here are 515 in-stock parts to pick from. https://au.mouser.com/Wurth-Elektronik/Power/Transformers/Power-Transformers/_/N-8u9n5?P=1z0jmj8&amp;Keyword=power+transformer&amp;FS=True
OK , I've messed about with the design tool. You can get it to work with a 1:1 transformer, but a 1:1.5 gets more sensible capacitor values and slightly higher efficiency. I've entered 4.7uH and 20mohm per winding and get ~ 85% efficiency, which is pretty good for 5v , without synchronous rectification. 
Finding a transformer gets more difficult , possibly something like this https://au.mouser.com/datasheet/2/445/749196547-1723684.pdf  (it's 3.4uH/segment) so about 12uH with two segments.. ( Hmm I'm thinking for one-off's it's so much easier to wind your own !!!) OK, I'll look again at the core you mentioned earlier.