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The turn signal switch is a 67,68 only part. There have been some people who have adapted a switch from other vehicles but I do not have the specifications.
I just bought a turn signal switch from Lectric Limited for my '68. You might give them a call and see if they have anymore.
I had the same issue on my 68 and tried to do a cam only swap.
It did not go on very easily and caused other electrical probs. I would highly recommend that you purchase the entire switch from lectric unlimited.
I got mine two months ago so they should still have some. Make sure that before you start the swap get under the dash and unplug the old switch and plug in the new and run it thru all functions (left/right and ck your brakes and flash)
There are alot of hit and miss issues with these switches but I think lectric unlimited is your best option.
good luck!
Here try these guys. I have purchased many column parts from them. They have the best prices I have found and use DHL for delivery and they are just A couple of old guys just in the business for fun. http://www.corvettesteering.com/corvette%20parts.htm
I went thru the same issue on my 68 when I was restoring it. That was 3 years ago and at that time no one made a replacement switch. I found out thru a lot of searching a switch from a 65 Pontiac Bonneville was the same switch with an extra set of leads for the side marker lights on the Bonne. Simply clip off those leads and presto same same. 67 switch is the same also. Good luck with your search.