had the same problem aproximatly 1 year ago.
some cheap aftermarket product i tried before did fit, but without any good deaccealration.
because of good advice here i bougt this high friction rgm brake shoes for my rear break.
they didnt fit in, like yours.
i milled both of the flat cast surfaces (i do not remember the kind of matirial, but definitly without the 06.0013 slipper on , instructions told there is no need for ) until the excentershaft encounters equally and they nearly fit in. then i used grindingpaperin the drum on both shoes. ... just a evening with beer and music...
the breaks are doing very fine now, but i am sure you will find better advice.
good luck
some cheap aftermarket product i tried before did fit, but without any good deaccealration.
because of good advice here i bougt this high friction rgm brake shoes for my rear break.
they didnt fit in, like yours.
i milled both of the flat cast surfaces (i do not remember the kind of matirial, but definitly without the 06.0013 slipper on , instructions told there is no need for ) until the excentershaft encounters equally and they nearly fit in. then i used grindingpaperin the drum on both shoes. ... just a evening with beer and music...
the breaks are doing very fine now, but i am sure you will find better advice.
good luck