What exactly is the whole unit?
Then how old is it as in when was it sold new. Lares doesn't cross the number
https://www.larescorp.com/ when you put it in a parts search
Best I can say is to send them an email including photos of the complete pump as it may be a long obsolete number.
You might search Lares by original applicaton as the brand is sold by seveal sources.
They seem to be an aftermarket manufacture of oem style parts.
The only pumps that I know of offhand that use a push in dipstick are the old round body Ford pumps.
Both Napa and OReillys crossed 390427 to a brake master cylinder that apears to be the same master cylinder in both cases.