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I did spend several minutes comparing the .75 to the .8. Neither seemed an absolutely exact match but the .8 seemed very, very close. That said, it could well be .75 as they are a minuscule amount apart.
Maybe another opinion from someone with exceptional eyesight
It is, of course, highly likely that Eurocarb are a more informed source than me
I apologise for not being able to confirm the pitch of the M5 jets that Dell'Orto produce, but I cannot find my metric thread gauges, only my Imperial set.
There is an 'M5 x 0.75' though the difference in pitch (0.05 mm) or two thou" is so minute that I would be tempted to use the widely available M5 x 0.8 if it were just a matter of cleaning up an existing hole, particularly as it is likely only the start of the hole will need any correction. If that is the case, a tapered tap - not plug - would tidy up the hole enough to allow jets to be re-inserted.