always fit a pair of the same make and number
you wouldnt fit brake pads from mixed manufacturers on the same axle would you !
were both boxes sealed i bet not ,we get it all the time boxes opened bits missing
easy you want a bit, order it take out what you want send it back
then the next poor sod gets it with bits missing
we have had stuff from unipart boxes held together with masking tape etc
we even had a set of discs with copaslip on the back
some b******d had fitted them and took them back off