Wally, I didn't see brown or red buttons, but there are some assorted RMK sheath snaps and straps in this ebay lot:

Item no. 232161312918

Title: Randall Made Knives Misc. Snaps & Stones SP-13 Knife Pocket Hone

Hope this helps.

Bob
_________________________
Bob Carlin
rfcarlin@hotmail.com
RKCC #622