Need help...key-in-ignition buzzer switch

[L16pilot]

Hi all,

Hoping the wealth of knowledge and experience on this site can help me correctly identify the GM PN and alternative superseded PNs that would be correct for the key-in-ignition buzzer switch in the tilt steering column for my 70Z. I have the Chevrolet Chassis and Body Parts Catalog dated April 1983, and from it, they have two PNs that apply:

7811093 69-70 All w/ T.W.
7811092 71-75 All w/ T.W.

Based on the GM Parts Book, I need the 7811093, but I am pretty sure there is no functional difference between the 70 and 71 tilt columns. I've tried using an aftermarket switch, but they are extremely fragile (two were broken upon receipt), so I've been looking for an NOS switch...have not been able to locate one yet.

Therefore, does anyone have any experience with the tilt column key buzzer switches to advise if there are any other GM part numbers that would work in my 70Z tilt column...or know of a source where I can get an NOS item?

Thank in advance for any help or assistance on this