Good day,
They are a standard 'roll pin'.
I'd measure the size and order through ebay. Use the caliper hole to measure with a drill bit.
They only ensure orientation of the hose i.e. prevent rotation.
You should be able
to get the correct length, although a little shorter won't do
any harm. So long as they protrude plus minus 4mm from the caliper
they'll work well.
Regards
Nigel