Hey Tom!
Don't know where you're based, but in Belgium and the Netherlands they're easily available second hand online. For little €€€, just google it! If you don't find a place, let me know, i should have some link of a company that surely has them saved somewhere on my computer.
For a cheap upgrade, I changed my spring for the hyperpro one.
I was (and still am) pretty pleased with that. Alone and even 2 up fully loaded.. always served me well!
Don't know about the dimensions...
Hope you find one!
A.
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