Rear suspension noise

[Porsche man]

Thanks Guys for your posts. Gives me a few alternative parts to consider and check.
I notice that some of the non Porsche parts are considerably cheaper. Noted that lower control arms on Ebay are half the price of genuine Porsche parts.
Is there any non Porsche parts supplier that is reputable?
Can the trailing arm be re bushed or does one have to purchase a complete new arm?
Cheers