Yep, another mystery...
The driver pack includes the profile though.
Epson_SP4900_Exhibition_Fiber_Paper_PK_v1.icc
If you have the drivers installed (obviously) it will be there.
What media type to use?
Set the printer itself to "no paper selected". Then set photo paper>exhibition fiber from within the driver prior to print.
There is no "exhibition fiber" setting on the 4900
Really odd....
I believe this is the correct way to do this.
JD