Yes, many of the manufacturers use the same bridge guard source rather than reinventing the wheel.
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My guess is that they just aren't shipping any to the US anymore. Could always ring up Felder and see if they'd sell you one for an A3-31.
Regarding cranking, I have a Hammer A3-41. My simple and cheap solution may not be the sexiest, but it took 20 minutes and $12, including paint.
https://www.youtube.com/watch?v=veJPpksmW8w