I have a 91 EF si and I want to convert to the seat belts mounted on the pillar similar to the 89 model. I read that EG belts will work too.

Problem is I checked and my EF si only has holes on the pillar mounting section. It's supposed to have the threaded hole, to put the seat belt bolt.

Is there anything I can do? It's unfortunate my car doesn't have bolt hole in the pillar, so I can easily replaced seat belts.

Any ideas?