I believe -A is an obsoleted spec and I think were now on -G or -H rev, so Wicks prob hasnt bothered changing their bottles. That said, call 'em up.
I think mil aircraft are on Mil-PRF-5606H super clean stuff.
BTW 5606 is a hydraulic fluid, not necessarily "brake fluid" like a DOT 3,4,5 etc.....
Bushby Mustang II (building); IO-360B1E, C2YR-BF/F7666-2
Don't be a hater; I'm a cousin with thin wings!