I found out that the 4503 with Supervisor Engine II-Plus-TS supports the GLC-SC-MM SFP module. The problem is that I can't find it, looks like Cisco is not selling it anymore.
I found only this: GLC-SX-MM=
I the Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix
it says that this SFP is only compatible with 4506 and others, not 4503.
What SFP module could I use on the 4503 and 2960 for Multimode fiber?