You don't need any "Special" bends.

Use a standard compression elbow either 32mm or 40mm whichever is the correct size.

The pipe on the right is a slide fit into the centre cross (adjusts for different sink sizes), fit the standard elbow straight onto the end of that.

The "J" piece of the trap will either have a tapered seal on the top or a collar that you can cut off then fit the other end of the Standard elbow onto there.

.