When you model a Cisco Catalyst 2960X-48FPS-L switch, Spectrum gives it a Device Type of Cat WSC2960S 48TSL.
Cisco reports the wrong sysObjectId for the Catalyst 2960X-48FPS-L Switch. The agent says the sysObjectId is 18.104.22.168.22.214.171.124.1695, when it should be 126.96.36.199.188.8.131.52.1208. Cisco has confirmed a bug in the firmware.
Please contact Cisco support.