I'm sure the STC'ed ones are fine, but the Service Manual has a big warning saying not to use a quick drain as it could interfere with the nose gear transit. It looks like a "short" quick drain will work, but not a normal one. YMMV.
Here is the correct one for our Skymasters for $115 from Wag-Aero:
https://www.wagaero.com/low-profile-...es-p-nf65.html
I've attached the section from the manual.