Dekoni explicitly lists Elite Fenestrated Sheepskin for the Drop x HiFiMAN HE5XX and states its custom-molded clips attach to the HE5XX. It describes smoother bass response and a small dip just above 10 kHz versus stock.
Dekoni explicitly lists Elite Hybrid for the Drop x HiFiMAN HE5XX, says its custom-molded clips attach to the HE5XX, and describes it as closest to stock style with a small sub-bass dip and higher low-frequency content matching the original.
Dekoni explicitly lists Elite Sheepskin for the Drop x HiFiMAN HE5XX and states its custom-molded clips attach to the HE5XX. It describes more consistent sub-bass, attenuation into upper bass/low mids, and recessed vocals and higher frequencies versus stock.
Dekoni explicitly says its Elite pads are for the Drop x HiFiMAN HE5XX, lists Elite Velour, and states the custom-molded mounting clips attach to the HE5XX. Its stated acoustic note also identifies a sub-bass dip for Velour versus stock.