Oil pump kit???

It’s been about 5 years ago I was able to order the oil pump rebuild gaskets separately. The oil pump mounting gasket, the o ring gasket that goes under the rotor plate, the small gasket that goes into the relief valve end plug.
Give me a day or so and I will look in my parts manual and get the part numbers.
Another place to look and do a search is on e bay, from time to time nos rebuild kits that include the inner and outer rotors and the gaskets are posted for sale.
Also look on Rock Auto, they may have the individual gaskets for the oil pump.
And I just looked on the Rock Auto site, I looked under a 1967 Dodge Dart with a slant six and they listed the main seal that goes between the block and the oil pump and the o ring seal that goes under the rotor cover plate. That is two of the three oil pump seals. You could use a copper ring seal at the by pass end plug.