Shoulder belts needed for 71 240Z

I have a 1971 240Z and have got the lap belts only. Somewhere along the line this car lost its shoulder belts. I want to run this car in the MSCC autocross series in the stock class. I found that I can retain existing seats and be legal in stock if I had the shoulder belts. I can't afford to put in a harness and driving seat at this time. I need both the driver and passenger side belts along with the mounting bolts. Can anyone help me out? billlock@cheqnet.net