5.25" or 6" 3 way speaker recommendations

Please don't kill me due to the basic level of my system. I am restoring a 50 year-old Citroen Mehari and want to add sound. The easiest/most cost effective retrofit without cutting etc. is a surface mount kit for 5-6".

I will be using a bluetooth class d amp and to compensate for the lower voltage/power, I am looking for some relatively high sensitivity 3 way drivers. I found some cheap Pioneer one at 88db, but this still seems pretty low. Does anyone have any recommendations?

Many thanks.
 
If you're looking at low-cost speakers, you need to buy some that you can listen to before buying.

Sometimes high-efficiency means limited low frequency response. I realize that you're not looking for bass from these but really efficient speakers in a small volume of air may only be good for voice.
 
Gotscha, thanks, this handy occured to me. I got a set of Alipne 3 way speakers at a modest 92db sensitivity. Hopefully they should just about cut it, but we'll find out. At least they weren't pricey. The car's so rattly anything expensive would have been wasted on it.