These sleeves are perfect for the game Space Base and any other cards that are 40 X 89 MM in size. Note that they sized these for 40 X 89 cards rather than 39 X 89 so they could also accommodate Coin & Crown, another popular game that is just 1 MM wider than Space Base cards, but both of these games' cards will be well protected in these sleeves!.
ISS Vanguard Compatible Sleeve Bundle (8803 X 4, 8810 X 7, 8812 X 1, – GameWorkCreate
Accessories - Board Games India
Sleeve Kings Mini Euro Card Sleeves (45x68mm) - 110 Pack, 60 Microns : Toys & Games
Sleeve Kings Quality Card Sleeves - Protect Card & Board Games – Mayday Games EU
Sleeve Kings Space Base Compatible Sleeves (40x89mm) 110 Pack
110 x Magnum 7 Wonders Card Sleeves (65mm x 100mm)
100% Polypropylene, Acid Free, Not for Children under 4
Sleeve Kings Standard USA Chimera Card Sleeves (57.5x89mm) - 110 Pack, 60 Microns
Sleeve Kings (40x89mm), qty 110, microns 60
Sleeve Kings Space Base Compatible Sleeves (40x89mm) - 110 Pack, -SK – GameWorkCreate
Board Game Sleeves, Protect Your Game Components, Pangaea Gaming