Lot of Spicer strap kits as shown.  Each box has 1 strap and 2 bolts.  Each unopened bag has 1 strap and 2 bolts.  Each of these boxes / bags appear to be 1/2 kits based on the Spicer part #.  The bags have the same parts inside as the boxes with possibly a different distributor.  It looks like there would be a total of 4 pairs.  Please check out the photos.