For my 818, I received some back ordered spacers that should be 0.43” but I was sent 0.40”.

They were documented as 0.40”, this isn’t something I have determined through measurement.

My question is - are they OK to use in place of the 0.43 or is that extra 0.03 critical? I have received 12, which I think is almost the whole set required in the kit, so it’s not the odd one or two.