While I believe this information to be reasonably accurate, I haven't actually ordered or vetted the information in this thread, proceed with caution.
I will update as members give more info and feedback.
==================================
Chrysler # 6503598
Used to hold air splitter in place among other things...
Also some locations inside front fender well
8mm hole, 20mm head, 25mm length(?)
Amazon.com: Chrysler Push Type Retainers Clips (Chrysler # 6503598) - Package of 20: Automotive (Mopar)
Amazon.com: GOOACC Nylon Bumper Fastener Rivet Clips Automotive Furniture Assembly Expansion Screws Kit Auto Body Clips 8mm - 40PCS: Automotive (3rd Party aftermarket)
Amazon.com: Chrysler Jeep Dodge Automotive Push Pin Rivet Mopar OEM: Automotive (HORRIBLY overpriced - EACH!)
======================================
(Reference) Oil Change Push Pin / rivet
Chrysler # 6506132
Amazon.com: Chrysler side Radiator Shield Push-Type Retainer (Chrysler # 6506132-AA) - Package of 24: Automotive (pkg of 24)
20 Side Radiator Shield Retainer 6506132-AA Fit Chrysler Sebring Stratus 20x17mm | eBay (ebay)
===============================
Other references:
Larger bolt to hold on lower, rear shield under engine during oil change
6508332AA
Under-Body Shield Screw - Mopar (6508332AA)
=========================================
Still looking for p/n for smaller bolt?
http://www.hellcat.org/threads/lower-push-pin-part-number-for-belly-pans.5892/#post-145696
SRT_HC_707
===================================
I will update as members give more info and feedback.
==================================
Chrysler # 6503598
Used to hold air splitter in place among other things...
Also some locations inside front fender well

8mm hole, 20mm head, 25mm length(?)
Amazon.com: Chrysler Push Type Retainers Clips (Chrysler # 6503598) - Package of 20: Automotive (Mopar)
Amazon.com: GOOACC Nylon Bumper Fastener Rivet Clips Automotive Furniture Assembly Expansion Screws Kit Auto Body Clips 8mm - 40PCS: Automotive (3rd Party aftermarket)
Amazon.com: Chrysler Jeep Dodge Automotive Push Pin Rivet Mopar OEM: Automotive (HORRIBLY overpriced - EACH!)
======================================
(Reference) Oil Change Push Pin / rivet
Chrysler # 6506132

Amazon.com: Chrysler side Radiator Shield Push-Type Retainer (Chrysler # 6506132-AA) - Package of 24: Automotive (pkg of 24)
20 Side Radiator Shield Retainer 6506132-AA Fit Chrysler Sebring Stratus 20x17mm | eBay (ebay)
===============================
Other references:
Larger bolt to hold on lower, rear shield under engine during oil change
6508332AA
Under-Body Shield Screw - Mopar (6508332AA)
=========================================
Still looking for p/n for smaller bolt?
http://www.hellcat.org/threads/lower-push-pin-part-number-for-belly-pans.5892/#post-145696
SRT_HC_707
===================================