So next time maybe cable tie a couple of small plastic bags to the entire cluster of stationary QD caps to keep them from getting ripped loose/off.
Take one of the other QD's O-rings to a local auto store, they should have a selection to choose from, or a hydraulic shop or tractor dealer......
Yep lesson learned on the dust caps. I run it down in my land in TN mowing the CRP fields with no problems with the dust caps on. This was my neighbors field up here in PA that I was doing for him. If I do his field again I am just going to leave the FEL on. I tried tying a gallon heavy duty bag around the cluster when the first 2 caps got torn off. Briars tore the bag to shreds.
I'll pull one of the other o-rings like you suggest and buy a bag of them once I match them up.
Thanks to everyone for the suggestions.......I heard you Sawyer Rob...WD40