yeah the 195 covers usually sell for $100, so good luck finding one! the auto covers don't fit over the 180/195 lens. there is someone on ebay who sells custom 180/195 covers, melts and forms regular covers, but i haven't seen them on ebay for awhile. think they were around $40.
i left my 195 cover in a semi-abandoned building in shikoku after taking a long exposure shot. it was falling apart and held together with tape, but it was better than nothing.
how well pola works after expiration depends on many factors. i have 107 from 1977 that works, and 669 from 1989 that works, but also have 667 from 2009 that is dry.