I ordered this Luer adapter and it works great:
Fittings Space “Metal Male Luer Lock Syringe Fitting to Metric M5 M5X0.75 Male” Dynapex Part Number qbu2m_m_m5x07km.
https://www.fittings.space/qbu2m-m-m5x07km
Fits McMaster-Carr “Tapered Heat-Set Inserts for Plastic, Brass, M5 x 0.80 mm Thread Size, 6.700 mm Installed Length” Part Number 94180A361.