NE1 have pics of the seat belts for 71 bucket
There is a different style used in 71 than in 70. The 71 style is a bit more what your used to these days vs. the paddle latch on the older style. if I can get out to the back garage today I'll shoot some pics of the belts in my GSS, it will be exactly like your car (but be laid out just like shown above).