DIY Audio Electronics from Zynsonix.com: Fostex T50RP mk III Modded Build - New Cups, Cable, the works!
Archimago's Musings: REVIEW / MEASUREMENTS: Dekoni Blue ("Approved" Fostex T50RP Mk 3 mod). And the importance of the room for hi-fi reviews (Wilson Chronosonic XVX speakers in Stereophile).
Fostex T50RP MK3 Professional Semi-Open Headphone | ESV
Fostex T50RP Studio Headphone Review - audiopolitan
MrSpeakers Alpha Pads fit the new Fostex T50RP MK3's perfectly! : r/headphones
Fostex T50RP MK3G Studio Headphones RP -Regular Phase with Box 636827306119 | eBay
Balanced Modded Fostex T50RP MK3 Headphone Bundle with Pellucid-PLUS Cable
DIY Audio Electronics from Zynsonix.com: Modifying the Fostex T50RP Headphones