LF and FF sound like Baldwin filters which are probably fine. I am not sure if Baldwin filters come with the filter cap installed or not, so double check that before ordering.
19qts is correct on the oil capacity. The last 2 or 3 changes I put in 5w40 T6 because the 15 wasn’t available. 5w works fine too. Mine seems to prefer 5w as soon as it gets below about 45*.
Bobistheoilguy has a fair amount of discussion on oils in a 6.0 if you want to do some light reading.
And to answer your question about removing the filters, you unscrew the caps and remove the filter element inside and replace the element.
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