convertible saab 2000 9-3 leaking fifth rams...?

HI
I own 2000 Saab 9-3 convertible. Both the fifth rams on the soft top mechanismm are leaking badly. I'd say I have 30/40 times moved the top up & down and it emptied the hydraulic oil container completely.As a result the one before last position fails every time. This is when the back trunk cover is already down and the back windshield is up and slightly backward and in order to come down has to pass the vertical and I have to help manually. My guess is that due to the severe leak the ram is lacking power.
Any way to rebuild these rams as I know they are super expensive? Or an alternative to Saab parts?
Any help would be greatly received.
PG
Los Angeles