Caterpillar 20 seat

Where or possible to do it myself find a caterpillar seat?I just have the bottom springs and top springs sticking out.Im assuming that there the original seat?Can I make use for them or are they garbage?Thoughts opinions please thank you-Joey 

there is a bloke who advertises in the club magazine. hahn seats i dont know the phone number. i have heard he does good work.

I have had seats re covered. They never use the springs, just fill with blocks of foam. Good or bad?

well foam wont rust and the dig in your arse giving you arse nick poisnin and tetanus. but unless the correct type of foam is used they dont last as long as a proper spring containing seat not a big issue with antique machines as they are in retirement and dont get used all the time. having a spring type seat made would cost more probably.