Double Arm Window Riser Spring?

[mrraford]

The joys of the less than common Model A!
The drivers side window riser large spring on my 68C door is broken. I was wondering why it was so difficult to crank the handle....now I know.
I don't have a regular window riser for comparison but it appears similar to the regular riser springs.
Does anybody here that knows Vicky's, slants or 68Cs know whether the regular large spring sold by the suppliers will work for the double arm device? Or do you know a source for these?