Kelbly's is very good to work with. I understand the distance but you might find getting the correct spring from Kelbly's is the fastest and least expensive option. While you are at it you might consider a new firing pin spring too.
http://www.kelbly.com/contact.html
Would you believe that i need an export permit or some sort of licence for Kelby to send me 2 springs.
Whats the world coming too!
I had 2 You Dave trigger springs sent to me a few months back, no problems, not from Kelby's.