I really like the headphones, found the sound excellent, butThey are a bit uncomfortable as the ear pads sit on top of your ears and the pressure gets uncomfortable after awhile. Not only are they comfortable, but the sound is so much better.
Great Size Over Ear Pads For Koss Portapro Porta Pro Ksc75 Kph40 Kph30i Headphone Headset Earpad Sponge Cushion Foam Pad Covers
Yaxi Pads for Koss Porta Pro, KPH30i & KSC75 - Gears For Ears
Voarmaks Great Size Over Ear Pads Compatible with Koss Portapro Porta Pro Ksc75 Kph40 Kph30i Headphone Headset Earpad Sponge Cushion Replacement Foam Pad Covers (Great Over Ear Pads) : Electronics
The Koss KPH30i Will Change YOUR Life!! - Home Studio Basics
Great Size Over Ear Pads For Koss Portapro Porta Pro Ksc75 Kph40 Kph30i Headphone Headset Earpad Sponge Cushion Foam Pad Covers
Luxurious Large Size Ear Pads Foam Cushion For KOSS Porta Pro PP KSC35 KSC75 KSC55 Headphone 1Pairs - AliExpress
Voarmaks Great Size Over Ear Pads Compatible with Koss Portapro Porta Pro Ksc75 Kph40 Kph30i Headphone Headset Earpad Sponge Cushion Replacement Foam Pad Covers (Large Size On Ear Pads) : Electronics
Found this suprisingly kind of promising looking headband mod on aliexpress For KOSS Porta Pro, KSC35, KSC75, KSC55 : r/headphones
Deez Labs, Online Shop
Ultimate Guide] Koss Modification – Ear Pads, MMCX Sockets, and Detachable Cables, Oh My!