WS-X6182-2PA is supported on SUP720 and refer below some of the information that will come handy when you order the parts.
On SUP720, you need WAN Feature set Software to support the WS-X6182-2PA module. When you go to the download page, you can see the image filename that as "_wan" and these images should support WS-X6182-2PA.
And also, WS-X6182-2PA is End of Sale and already past Last Shipment Date of April 15, 2006. Please refer the below document for replacement parts:
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...