Can not answer this as of yet.  Shorted three pcs and unable to get past part 2 in instructions.  However: when I called customer service they were very knowledgeable about the product and parts concerned.  They are shipping out missing items immediately.
Wish they had listed in the information before I placed the order the actual size of foundation needed.  The item is listed as 15 X 8 exterior dimensions.  After receiving shipment and reading instructions, it states that the foundation size should be 178 " X 93 1/2" - too late - I had already build my foundation to the size listed on size listed on add.  Hope this is the worse of it.  Look forward to receiving the missing parts and completing my building.