[Vwdiesel] 82 VW Rabbit with no lap belt

[Dave]

Hi,

  I am beginning to work on a 1982 VW Rabbit diesel that has been just sitting in my garage for about 5 years. I quit driving it back then because of engine problems and last Fall before the cold hit I put a diesel engine from a running diesel Rabbit in it. I am working to get it ready to give to my son for his 16th birthday. 
  Here's the question. It has a shoulder belt that goes across and clicks into the door, but there is no lap belt. My wife wants me to put some sort of lap belt in it before my son gets it. Do any you know how I would do that or where I would get the belts? 
  
 Thanks

Dave