Circling back with a final update.. i wound up buying the rear pads from Peace Sports as none of the online options were exact match, at least not the ones i tested.
After fitting the pads, the original issue of weak rear brakes was still apparent and i further found that the pressure would be lost intermittently, indicating an issue with the master cylinder. Today i received the replacement rear master cylinder i found on Amazon that looked like a match, installed it and bled the system.. problem solved and she brakes great now
Link to rear master cylinder:
https://www.amazon.com/dp/B09ZP94XZ1...roduct_details
MWMNUN Universal Rear Brake Master Cylinder Compatible with 70cc 90cc 110cc 125cc ATV/Chinese Dirt Bike/Yerf Dog 150cc Arctic Cat 700 EFI 2006 Roketa Taotao Yard Card 150cc Go Karts(GOLD)
I did have to make some modifications to get it fitted.. added a metal plate to attach to the stock mounting bracket as it sat too high, and then re-routed the filler cap to the carb side of the intake box