One advantge of the Rennline over the Pedro part is that rennline is adjustable.Pedro's is not. But Pedro's fits ,so why bother with adjustment ? Not sure . If you want to go diy + adjustable ,suggest you investigate this:
Speedway IMCA Approved 3/4 Thread Swedged Steel Tube + heim joints
Swedged Steel Tube, 3/4 Inch Thread