1965 Barracuda......advice needed.....

Hi- Im new here guys- Im having a problem with replacing my turn signal switch; I have ordered two new ones from Ebay and both are the same; the switch itself is smaller than the original and when it is in the column and I turn the wheel the TS switch comes on(without using the lever(; then when you turn the wheel back it turns off- both directions. The switch must not be the right one? But the sellers on Ebay say they have sold "hundreds" and never had a problem. Any ideas for me ? Thanks.