I'm not sure. I've never seen a RM with 26s on it. Most of the remaining RM in my area are driven by 'older folk' and I really can't see them putting 26s on their cars

. Perhaps you could contact Tirerack and ask one of the associates there. They have always answered my questions when I contacted them. They might be able to give you a little more insight on what needs to be done.
EDIT: I remember seeing something similar to your question awhile back. After some quick searching, I came up with this thread asking a similar question about putting them on a Caprice,(which is another B body GM car like the Roadmaster and Impala.) Here s the link:
http://impalassforum.com/cgi-bin/ult...22;t=002521;p=
Obviously, reading down through the thread you can see that the idea does not go over well with other B body owners, but there might be some info you can use.
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