The closest spring I ever found was from Reid Supply, their item CX-14.
http://www.reidsupply.com/Detail.aspx?itm=CX-14 While not exact with your dimensions, except for length so close I think it might work. Comparing with the original, if the free loops are the same (3) it might be able to stretch -- there is another with slightly larger diameter wire also a possibility.
Agreed, the spring is critical but I am not sure that is the entire problem. From the very few pictures of other units I've seen so far, Packard seems to be the only one who mounted low and at such an angle. Am not totally convinced that the angle doesn't have something to do with issue. To my mind it positions the valve port in the perfect location to have any debris or chunks of congealed fluid float right to it and lodge.
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