If you wish you can go to any Royal dealer and buy a "B" type outer bag if you do not want to fuss with the "A" bags or F&G bags.Just keep the old one for the collection-and use the "B" bag as the driver-performance is often better,too.Yes,the F&G bags work-but on one brand-Riccar replacements for F&G-the paper fill tube sometimes rips.When I use the "B" bag-I use the grey "Commercial" replacement one that can use the "B" bags-less expensive.Guess now it would be orange.And you could put the Royal dump bag on the machine if you wanted.
I wonder if you could please take a picture of the nameplate... because this being in Canada, it may have a different format there than here in the USA.
Going by the date code you found, it appears to have been made on February 20, 1987 (7 is 1987; 051 is 51st day of calendar year, or February 20, 1987).
You have a 1987 model 608-CA (CA is Canadian specifications).