Hey Mike - I am going to pop out one of my rear mid-range speakers and compare dimensions or get a "donor speaker" from Ebay for $20 to hack apart and play with -

Here is an example of one that might work, just have to check the dimensions of the stock driver so it fits in the little "receptacle" properly -

Peerless by Tymphany NE65W-04 2" Full Range Woofer


EDIT: Stay tuned, I just bought a $15 rear midrange speaker on Ebay in order to get proper specs and dimensions of the driver so we can find proper replacements for that location - yes what Prop did is fine using Tweeters in that spot but would like to give true midrange dimensions -

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards