I need to replace a feathered treble hook on my original Pop-R as the feather came loose today after hooking a fish. What brand(s)/size do you suggest? If possible, I'd prefer real feathers too.   

Shoot me a PM with your info and I'll send you a couple

WalMart just started carrying some Eagle Claw feathered trebles recently. I've put some on a couple poppers to replace the long gone feathers they had on them and they've been nice. 

I run #6 and #5 on poppers, and tie my own. I like the round bend Gammis, I don't even have to set the hook, just reel tight.

Last time I have to replace one on my pop-max I use Mustad. Size you should match the original. I think either #6 or #4.

https://www.tacklewarehouse.com/Mustad_Feathered_Treble_Hook_Red_Hook_2pk/descpage-MDTR.html?from=gshop&gclid=CjwKCAjwiLGGBhAqEiwAgq3q_grO9L8eVnabbYdSj444h_qqsNpqhWOGmLD8mRgsNI8rLsLqdGDxWRoC9z4QAvD_BwE

Big fan of the Owner Tournament Trailer Feathered Trebles, also available at TW. Like the color selection, and Owner is a great hook. Also use Gammi’s when I can get them discounted.