If they are doing a professional install of a 5 LNB dish, they have everything they need to install it with the tripod. They unfortunately may not be able to use your existing tripod.
I've actually placed a 2" pipe in a standard tripod for a HD install (with supervisor approval and the understanding that if it didn't work we'd have to use a non-pen roof mount)
The pole barely fit, and I had to use self tapping screws to hold it into place. A month later and I haven't been called back yet!