Hey gary, Actually I found a pretty simple way to work those out. For the lap belts, I just ran down and used the stock belt holes to mount them, you have to bend the bracketry a little if I remember right, but it all fits up good. as for the shoulder harness, buy the simpson 5-way harness mounting kit, its part no. 856-31020 from jegs and runs like $14.00. Just drill a hole behind the seat and run the eye bolt through, then you can have a removeable shoulder harness, because yes, they do get annoying to have in there at times.
Here is a pic of the harness mounting kit:
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Daily Driver: 1992 Blazer dropped on rallys
Project: 87 GMC shortwide, About to get a little boost