They were inserts in Topps packs, and as such are located in 1995 Topps. This is mentioned in the Release Notes for the 1995 Stadium Club set. Additionally, the set is listed within the parallels of the Stadium Club inserts/related sets page, with that cross-linking to the Topps swet.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).