This is another compact polypropylene cap that I use for coupling purposes:
https://www.digikey.com/en/products/detail/panasonic-electronic-components/ECW-FD2W225J/3844558
https://www.digikey.com/en/products/detail/panasonic-electronic-components/ECW-FD2W225J/3844558
Rel Cap, My favorite cap, but hard to find....
Now owned by Wilson Audio Specialties
https://www.reliablecapacitors.com/
801-377-2397
2233 Mountain Vista Lane
info@reliablecapacitors.com
Provo, Utah 84606 USA