The protecto plate and axle read
The 0228K is Feb 28 (196) and I think the K is for McKinnon Industries, who was likely the supplier up in Canada.
But the BK has me stumped. It's not a Pontiac thing, as the same axle goes under the Impala, so it must be a McKinnon Industries (ie: Canadian supplier) thing but the codes are nowhere to be found!
Anyone have any data for axles that came from McKinnon?