Question: making a bidirectional TVS

[Circuitous]

I need to repair a circuit that had a damaged transorb (1n6281C).  The new components arrived today, and I realized that I didn't quite order the correct component (1n6281A).  The difference is that the original is a bidirectional TVS, but what I have are a bunch of unidirectional TVS diodes. 

Question:  can I just replace the original bidirectional with a pair of unidirectional diodes, in reverse series?

Wikipedia (that often not-quite-right source) states that this is how a bidirectional TVS works.  Is this correct?

The device in question needs to be re-installed on Friday on a radio tower, so I don't have time to order something else.  http://corgitronics.com/2012/08/26/radio-tower-navigation-lights/

[Short Circuit]

Use just one, and add a regular powerdiode anti-parallel. _{sorry,uni and bi's got mixed up somewhere between screen and keyboard}

Reverse series config is to make a bidirectional TVS out of two unidirectionals, so yes, WP is correct.

[Psi]

A bidirectional TVS (or two unidirectionals in series) will protect against high voltage spikes in both positive and negative directions, eg for 20V TVS it will clip at above 20V or below -20V.  So it's good for protecting an AC line.

If its for a DC power line then any negative voltage is unwanted.
So, as said above, you can use a regular diode to clip the negative at -0.8V and a TVS to clip the positive at +20 (or whatever)

[Circuitous]

A bidirectional TVS (or two unidirectionals in series) will protect against high voltage spikes in both positive and negative directions, eg for 20V TVS it will clip at above 20V or below -20V. So it's good for protecting an AC line.

Yes, the original bi-directional TVS was installed across the low voltage side of a transformer, about 14.5VAC RMS.
Thanks for the responses.  I'll keep the other approach in mind for DC protection.
I appreciate the quick responses, as we need to get the lights flashing at the top of the 400ft. tower.