REPLACEMENT COUNTER AND PISTONS FOR THE CSA ALPINE STEPPER?

I have an old CSA Apline Stepper (think I bought it around 1993-1994) which has had loads of use and I have had lots of replacement pistons for it. However, I have lost my paperwork and just wondered if there was any way of getting replacement parts for this machine bearing in mind it is quite old. I bought it from Argos in the UK but they dont sell it anymore.