For years I only bought manufacturers 'official' part-numbered replacements
because I didn't realize the extent to which interoperability existed.
Maybe 25% of corporate types still think that way and many more will
want a 60-day guaranteed replacement. That, my son, is why resellers and
their price-scales exist. Realize that a lot of their listings are not
updated
and when you call (well, not you) the buyer may get a mild rejection.
A sales tool, you see? Trolling of another sence (than yours).
John A.