The WS-X6848-SFP shows without the 2T bit as this is the only linecard listed then you can assume it is the right one.
One point though. You have an XL supervisor but you don't say whether the linecard is XL or not. If it isn't then you need to understand that you lose the additional benefits of the XL ie. the system runs in DFC4 mode for the DFC linecards.
The XL version of the supervisor supports larger hardware tables for certain entries and that is primarily why you buy it. If you then install a DFC4 linecard that is not the XL version then the supervisor has to drop back to DFC4 mode for compatibility. If you are buying the XL supervisor then usually you would buy the DFC4XL linecards to go with it.
Just to be clear, your linecard will work with your supervisor and it is more to do with hardware entries than actual throughput of data. So it is not a major issue as long as you didn't purchase the XL supervisor because you needed the larger tables.
See this link where, among other things, it covers the difference between DFC4 and DFC4XL and what happens if you mix them in the chassis -
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