I have a pair of L&R upgraded dash speakers from my 986. I replaced the factory speakers with 4" Alpine SPS-410 speakers (45w 4ohm).
The I attached and sealed the original mounting bracket and Porsche wire connector to these Alpine speakers, so this set is a plug & play drop-in for your Boxster.
They were made following the excellent write-up by thstone that you can find here:
Dash Speaker Replacement
I have used these for about a year, and they sound great, but I recently changed to a different brand.
UPDATE: In order to matching the color of your dash speaker grill, I have removed my cosmetic dash grille to keep it simple. All original brackets and connector remain, so you can pop on your black/blue/tan plastic speaker grill.
PRICE DROP: $40 plus shipping. I have these packed in the original box for safe shipping, and I can ship out same day.
email
kjwinter89@gmail.com for a faster response.