991 rear spoiler problem

[carrera79]

hello,
a very good friend of mine is having some problems with his 991 coupe rear spoiler.

He found a broken part and wanted to order the part new at dealer's shop.

The problem porsche now only sells complete system (4000$ !!!!)

he is looking for the arm (ref should be 99150404104)

Any idea to find this part new or second hand ?

thanks in advance

fred (only driving air-cooled ) without electric spoiler