Well, three things to note here, the first is that even with custom coolers, there are a lot of fairly reference cards, just custom coolers, on top of that, there are cards with a reference PCB but custom parts and such, so the holes and placements are the same, and last, you have fully custom cards. Luckily, companies like EK make blocks for a lot of different cards, and a lot of cards that use the same block it's easy to find the information on what to buy. Not every custom card gets a shiny block, but a lot of the bigger/OC ready cards do from major manufacturers, like EVGA, MSI, Gigabyte... Not sure if there's a block for the EVGA 980 Ti K|ngp|n, but I know there are blocks available that fit that card.