Different for each horn
Sop -- resin palm and side key risers, white roo pads, added a strap ring
Alto -- nothing -- it's pretty good stock, though there were some teflon bits added where cork used to be
Tenor -- perfect stock. Just wasn't anything it needed.
Big B Bari -- long story on this old girl -- after the complete restoration including a recutting and expansion of the engraving and a complete delacquering of the horn, I had a epoxy resin-based key riser put on palm D only, moved the strap ring 1/4" to the left, moved the r/h thumb hook 3/8" to the right, added an elaborate and very strong pants guard to get the B and C# rods off my leg and knocked 3/8" off a 400 neck to use the horn with small chamber pieces. Also added a flange underneath the G# key so that B, Bb, and C# all worked the G# (curiously, this isn't a feature of a any Buescher 129 baritone, but exists on the late 30's 139 baritone and all other Series 1 and later Buescher tenor and Altos, and also appears on the 400 baritones from 1960 on).