Help needed: Porsche parts numbers for throttle body return spring bushings

[Tromas]

Fellow Pelicans

I'm refinishing the throttle bodies on my 2.4L engine. I need to replace the plastic bushings sitting inside the return springs. I looked in the parts catalog but that part of the throttle body is not specified with respect to parts numbers.

Does anyone know what the correct parts number is for new plastic bushings, or have a good source for replacement part? 6 are needed.

All comments / PM are welcome.

Happy wrenching

Thomas