310, 315, 365
Reference PONTA www.aichi.to gives me doubt about 315D. I do not know whether or not 315D and rest of 310+Template:315 series are special, whether or not they are compatible with other 21mm drives and cables. Reference LWIK-3QAKDA also gives me doubt, saying "For TP 3## only.". However, I am going to be bold and lump these models and their peripherals into article body. My edits made so far were made with confidence. The last revision before I gamble/guess and integrate non-proven (mis)information is oldid=56593. As well, I will throw the rest of Template:365 models in 20mm, without proof. http://www.thinkwiki.org/w/index.php?title=Floppy_Connector&oldid=56593 --Numeric (talk) 2015-09-12
Also Fujitsu used D-shaped, trapezoidal, external floppy connectors, probably some same (fitting) connectors as used by IBM (and Toshiba and Dell). 'STYLISTIC 1000 EXTERNAL FLOPPY DISK DRIVE' 'Model No: FMWFD2'.
Also Sony used a D-shaped, trapezoidal, external floppy connector, probably some same (fitting) 17mm connector (as IBM, Toshiba). 'MODEL PCGA-FD5' '3.5” FLOPPY DISK DRIVE' for PCG-505.
Also HP used D-shaped, trapezoidal, external floppy connectors, probably some same (fitting) connectors (17mm host, 21mm drive). 'HP F1059C' 'EXTERNAL FLOPPY DISK DRIVE' 'FCC ID: DX9FD - 05P' 'TEAC Corporation FD-05PHG'.
Also Gateway might have used parallel port for connection to external FDD. 'Gateway 2000 MODEL: FDD144001AAWW' 'FCC ID NO. :GSU3T5PRS-2'.
Also Compaq used a D-shaped, trapezoidal, external floppy connector, possibly some same (fitting) 17mm or 20mm connector. For Compaq Armada M300, Series pp2056. 'Replace with COMPAQ Spare 136256-001' 'Compaq part 154989-001 (Option kit: 157282-B21)' 'SPS: 136256 - 001' 'SPS - DRV DSKT 1.44MB' 'AS #: 163482 - 004' 'Rev 2.021'. (Thank you, ChippiesAvalanche, for working to describe your item.)