are you talking about switching just the LNB out or the dish?
I thought there use to be a Superdish conversion kit that got 110/119/129 but it might be cheaper just to get a new dish assemblty
the mast will work for both
edit: they no longer make the repoint kit so you need a new dish
you could fabricate a bracket and add a dp lnb for 129.....did it on a super dish for a friend...removed the 121 lead to the dp34 and connected the 129 to it.....not real hard....or look on ebay for a re-point kit