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What type of helm do you have on there now?

I don't think the Big-T is available any longer. Otherwise I would have mentioned it in my post above. I used to have one on my 1978 Montauk.
You can still get parts for the Big-T but they aren't cheap.
http://www.teleflexmarine.com/cgi-bin...brary=1018

It would probably be cheaper and better in the long run to buy the Bay Star.
You can check out the dimensions of the helm below.
http://ww2.seastarsteering.com/BAYSTA...aystar.htm

Teleflex doesn't seem to give a dimension on the depth of the Big-T helm.
http://www.downloadingfiles.co.uk/tel...S-7413.PDF

The Bay Star helm is 3 15/16" in depth. I don't think the Big-T is deeper than that but I could be wrong.
Here is a photo below of the Big-T mounted on a 1973-1976 standard console.