Insert custom HTML on registration page?

I'm looking for a way to insert some HTML code exclusively into the user registration page, for the sake of tracking results of advertising. I see that registration is handled with applications/dashboard/models/class.usermodel.php but I haven't found any obvious way of accomplishing this. I could alternatively place the code on the page offered to confirm successful registration, if that's any easier.
A plugin would be ideal, of course, but I'm willing to get dirty and edit the core code if needed. Any insight or advice would be greatly appreciated!
Thanks!
A plugin would be ideal, of course, but I'm willing to get dirty and edit the core code if needed. Any insight or advice would be greatly appreciated!
Thanks!
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I should have known better!