After two posts, lots of searches and few responses to specific question, I, bit the bullet and bought a lap belt. The way I installed it is not ideal but it is easy. I used the stock belt mounts and bolts(the seat has to be removed to access both). By removing some washers and moving others around it works out somewhat. My only problem is one side of the sparco is mounted on the outside of the stock belt and one is mounted on the inside of the stock belt (hope you understood that). Although this is not the best set up both sparco and stock belts can be used similtaneously.
In use this setup is very helpful. The belt holds you firmly in the seat. You no longer have to brace yourself as much providing a finer ability to manipulate the controls.

 

Just the lap belt right? not the full harness?

 

Did the same but only spent $17.00 for a red clip button "Standard" lap belt. Works great.

 

I have a 6 point harness setup using the stock seatbelt attachemnts for the lap, roll bar hoops for the shoulders and the front seat attachment bolts for the anti-sub straps...

 

Sorry I didnt get to finish my thought, i had to sign off. Then i wrote a real long followup and erased it so now im tired. Any questions or help I can provide please ask.