are you keeping R12 as your refrigerant?
your compressor, dryer, condenser and evaporator will all likely have flare fittings.
unless you intend to replace all the components you are stuck with flare fittings. The new DIY system only has O-ring fittings available
there is a fitting to convert Oring fittings to flare fittings but I am not aware of any that do it in reverse -
A “bolt-in replacement” hose kit is, in my humble opinion, deceptive advertising in most cases.
whatever you do make sure you get barrier hose and not an old supply of R12 design hose.
Consider buying the fittings and the lengths of hose that are needed, fit and cut them to your car, remove them and have them crimped at a AC shop. Also possible they could crimp the fittings on installed hoses. I would approach an AC shop before beginning your project to see what assistance they can provide.
Good luck
Larry