These electronic parts are found in many devices from the 1970s and early 1980s. They don't always look the same. I found these in:
Roland CR-78, CR8000, Jupiter4, MKS-80, Promars, RE-201, RS202, RS505, SRE-555.
Korg 800DV, Lambda, Minipops 5, Minipops 7, MonoPoly, PE2000, Polysix, Poly61, PS3200.
Keynote Auto Rhythm.
And many more.
Please keep in mind. This leaky substance can damage your gear ! Get them replaced before it's too late.
This list will be updated.