OK, Now that makes sense... They are not for the QA for the blade and blower. They are to hang on the front bumper. The terminology is confusing to say the least.
On my 4110 I can hang 5 of them on without the FEL attached, and can get 2 of them on with the 380 plow I adapted to my machine. They are mainly used by people without FEL's to balance the tractor when running very heavy rear implements. They sell for $1.00 a pound also.
I am pretty sure you can't use them and the Quick Hitch at the same time, hopefully someone else can confirm this?