I'm about to dive into the added door relays project, so I might just a well replace the 29 year old front door speakers. Who here knows the size range as I would like to purchase the proper size in advance. Thank you all sooo much in advance, and have a great holiday. Jacques.
Original size on most I've seen are 5 1/4" but a 6 or 6 1/2" will fit just fine. you may have to redrill/relocate the mounting screw holes. Good luck with the relays.....the speakers will be easy.