What kind of tabs do I need for my promotion packet?

You don't need any tabs. Points are added do your promotion Point worksheet digitally by your S1. That is fed off of what is already on your SRB.
If your command or S1, or training room tell you that you need tabs, and that is a local thing and you should ask them for clarification

It is not ‘tabs’, but points that add up for promotion consideration. SPC (Join to see)

I have been part of 4 different RC battalions and they all have followed the same method for the packet, the same advice that 1SG (Join to see) posted. I won't repeat that, but offer additional advice. Make your packet sparkle. Print any copies of your documents with the best quality print and when applicable use color. Make sure that "portrait" facing documents are placed so that they will be read in normal (left-to-right) configuration. Make sure that any "landscape" documents (often the case with awards and citations) are placed so that the reviewer only has to turn the folder 90 degrees clockwise to read it. Trust me when I say that no one likes to work hard to have to review the info within. If a reviewer on the board has to spend time flipping the packet around and turning it in various directions as he or she goes through the tabs, that person will almost surely just toss it aside and move on to the next one.

Since you won't have a chance to face the board in person, this will be the only chance to show how well you pay attention to detail and show that you care about the product you are presenting.