I would like to enquire as to whatever part numbers 99R10-01A1 and 99E10-01 would be availible with a diameter smaller than the 11mm stated

There is no smaller receptacle available in these series.
The stud would not be able to fit into the receptacle.
 
A smaller component could be designed if the project requires at least 50000 pieces a year + tool charges.
 
There is another system that has 10,5mm of diameter.
This system's principle is different, it is a push-push system.
  • Push to open
  • Push to close
The part number is V15R13-1-1AB
It has the advantage of coming with a metric thread.
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