not answering your question exactly but as your replacing due to wear its worth saying the wear may be in the collapsable part of the column which can be welded if needed. Basicaly there is a plastic connection somewhere on the column which breaks in the event of an impact to stop the wheel being forced back at you in a very serious impact. But a little tack weld does the same job and has no flex. Dont worry it will still break if really forced provided the weld isnt too substantial.
the column can be replaced alternativly, a few people on here have had this done and the part is around £150 i believe, fitting shouldn;t be to hard, maybe 2-3hrs
I expect JAY172 can give you a more informed answer