Old Pioneer speakers CN21?

Good morning all,

I was wondering if anyone can help me find some info on these speakers, more specifically the size. They're OEM for a 93 Lexus SC400 and to figure this out I have to remove the entire back side of the cabin: seats, lower trim, upper trim, rear deck and speaker covers. I'm at a loss and have been scouring the inter webs and have come empty handed. I'm going to replace them, but before I take the plunge figure I'd ask for some assistance, if I remain dead in the water, then I'll just bite the bullet and pull the whole rear. Thanks in advance for your help.