I had to do the same for the 727-200F as I did for the 727-100F. ;)

I have found that sometimes the ACE for the Captain Sim planes states that is does or doesn't have winglets and that turning them on, then off and then back on (clicking on SAVE after each change) they appear as they should. Although in the latest versions of the 767 (1.4) and 757 (4.4) they are correct to start with and it is no longer necessary to do that.

I have not yet figured out how Captain Sim have done this in the latest version. As you know, in the earlier versions they actually had .mdl that was the the model with the winglets. It could be a built in code (xml) that the line ui_wglts=1 triggers to make it visible. But I'm just taking a guess.

Hope this helps.

Mark