You can use this same strategy for any buff you want to track (pally buffs, Druid HoTs, etc). Now, when you cast a rank 4 renew on a party member, it'll show up in your UI when you're in a party/raid. So for this example, enter 6076 into the Add SpellId field in Elv. The spell=6076 part of this url contains the ID number you need. In the example above, I looked up on for a rank 4 renew, and found it at this url. If you enter the specific ID of the spell to track, you can track that specific rank. Go to Filters -> Buff Indicator -> Add SpellId.

Fortunately, you can add specific ranks of spells that Elv can track. In classic this wasn't working, and finally hit me today why - it's because there are spell ranks in classic, and each rank has it's own ID. Take 'Renew' for example - in retail WoW, you can simply add Renew, and the addon will pick up on the fact that every time you cast renew on a party member, the little green square will show up with a little radial timer on it to indicate it's duration. The issue boils down to this: in Elv, the options assume that you'll be adding a single effect. However, one feature I loved was the 'grid'-like raid frames, and I was really irritated that the little squares to indicate active buffs on characters wasn't working and I figured out the cause, and I'd like to share my knowledge in case anyone else runs into this. I'm an ElvUI user and I was thrilled that support was added for classic.

Elvui unit frames only