leedy vibes

Hi all. This is my first post.
My friend Paul and I just came across and bought some nice vintage pieces. Pauly got a 40's? Deegan marimba and I got some '39? Leedy vibes. A friend of ours found someone with these vintage pieces, who wanted to get rid of them. They were very reasonable. I think we both felt like we were stealing them. I haven't seen Paul's marimba yet, but my vibes are beautiful. I spent about 10 hours going over them, polishing chrome, etc... here is a picure of a set that is almost identical to mine.
http://www.olympicdrums.com/LeedyVibraphone.html
The motor is original and works too. The belts are dry rotted though.

So here are a couple questions:

If I'm reffering to them properly, most of my post isolators are dry rotted and or missing. Do I need one on every post? Where do I find these, or can I find a rubber tube of the right size that works?

The keys are strung up with a standard string or rope with no spring. If I restring them and add a spring, is there anything to keep in mind? I was going to buy a spring at the local hardware store and use some military parachute cord.

I know Paul has similar issues with his marimba. And I said I would pursue some parts.

Any advise is appreciated.
Dave