Stuart Hindle

I've a broken spring and cannot find replacements. I'm told the part number is 4F0 511 115 CM I cannot find thi anywhere. I am told that sline is 30 mm lower than standard which is what I was told about the le,man's height. If I can use a different spring how on earth do I exactly which one. I've tried numerous companies for the origonal spring and told no chance. I'm off the road at the moment its a nightmare. On a lighter note, the weather is loads better so, cycling it is : ) Oh, Happy New Year : )