+2 Grey Z70500 Iss 3 / 0500 Iss 3. This capacitor set is for The Sinclair ZX Spectrum 128 + 2 grey Z70500 Iss 3 / 0500 Iss 3 only. Electrolytic Capacitors for : Sinclair ZX Spectrum 128. This will help to extend the life of your Spectrum 128 for many more years.