For a 980 Ti, the MSI GTX 980 Ti Gaming might be a better fit (though just) as it's listed as 140 mm tall.
Assuming it uses the same or similar PCB dimensions as the 980, the MSI 980Ti should fit but will require low-profile PCIe power connectors, otherwise the side panel won't close.
http://www.guru3d.com/articles-pages/msi-geforce-gtx-980-ti-gaming-oc-review,3.html
http://www.guru3d.com/articles_pages/msi_geforce_gtx_980_gaming_oc_review,3.html