The file 'Mk 5 & 6 Volkswagen Front Door Speaker Adapter 3D Printer Model' is (stl) file type, size is 72.7KB.
Made this for the Mk6 Volkswagen Golf it should also work in in the Mk5.
Made for 6.5" round speakers.
I used M4 Brass inserts pressed into the plastic to fasten the speaker to the adapter.
Speaker_Adapter_V5.stl | 289.7KB |