Going by that pattern of pins on the lopt, it would appear that the HR6290 is the correct lopt, just as HR says on their website. Probably the only problem now is finding one! I don't know if it's possible to contact HR themselves to see if they have any available but Donberg doesn't list it unfortunately. If you have the means, it's worth removing the lopt from the chassis and testing it with a lopt tester.