out of commission, cant drive my dart anymore

Your making a mountain out of a mole hill here.
Just go to any parts store and order up any of those part numbers listed by the company, for DISC brakes.
The calipers don't care what hose is bolted to the hard line.
No difference in a caliper, unless your getting deep into rebuilding them, internally with differences in dust seals.
Don't care what the O'reilly's catalog, computer listing is telling you.
The part number isn't correct for both drum, or disc, two entirely different animals.