I don't see why not? I used to have corbeus (not in the teg) and I used teh normal seatbelts...after I sold them,they went into an EG hatch,and we used the normal seatbelts in that,too
You can still use your stock seat belts. Are you getting a bucket or reclining seat? I'm planning to get the Recaro Pole Position bucket seat and a Sparco 4-point harness.