Larry:
The existing holes are 5/8" and use a 1/2" pin. If you want to use the same pins that are there now, I would suggest using a 5/8" drill if you have one that size.
Since I did not have a 5/8" drill, I used a 1/2" drill for the holes and bought two 3/8" pins of the same type but smaller diameter than the ones that came with the rack.
In my situation, I drilled the holes 6 inches away from the existing holes. I can shove the sliding rack in 6 in and have just enough room to mount 2 bikes. But you can drill them wherever it works out best for you. The location of the holes will depend upon what you usually place on the rack.
As you have probably already found out, removing and replacing these pins is very awkward - certainly not easy-to-get-at.
Hopes this helps.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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