Looks like the coil is discontinued. The most recent part number, which should be backwards compatible with all older revisions, is MA05678A or MA05678AZ.
That said, it looks like JakMax are selling the coil, P/N:
JM5510.
Not sure if they're new, used, refurbished, or a custom job, but you can get them, and they appear to come with a 3-month warranty.
OutdoorKing has them available on their website:
https://www.outdoorking-forum.com.au/clearance-items/victa-coil-ma05556a-jm5510.
Note, JakMax don't sell direct to the public.
