I used to setup Oracle Delphi turntables. I recently read an article about the new revamped Oracle. They supposedly have the parts you'll need to set up the turntable properly. I think it is in an old Stereophile. Maybe search their archives.
At any rate you will need a new armboard. You could probably have a new one cut from plexiglass. Even better would be aluminum. The next step would be cutting the hole for the arm. Denneson made a special protractor that would find the correct geometry. Hopefully the arm you buy will have template.
Before going through any of this though, you need to find find out if the Oracle can supply you with springs for the towers. Depending on the weight of the tonearm and cartridge you will have to get the correct springs for the needed tension. Oracle used to have a list of the tonearms and weights and could tell you which combo of springs would work best. This is critical as the table cannot be setup properly without the correct set of springs. That article I mentioned had a phone number to contact Oracle. It also descrbed the differences in each of those tables, I, II, III.
If you get the springs, see if they can supply a setup manual.
If you have questions I can try to help, I still remember some of the tricks. Setting up this table can be frustrating, but the sonics are worth it.
Good listening,
Steven