Eric, Good question, we do not currently have one to measure exactly. We will update the website as soon as we get the next shipment in. I do think you will be able to use the same holes and just add 2 more.
Mirek- You have to replace the whole heel housing to replace that tab. Unfortunately we do not have any at the moment. We get people trading in bindings and we then list the usable parts here. The heel should still function unless you want to use a brake in which case the tab is necessary.