Looks like Wahoo's is so expensive b/c they are giving you 3 axles. Guessing b/c you have 2 SBC bikes that you have the same length & pitch of thread.

You can avoid this by going the Kurt Kinetic route, pre-selecting your thread pitch, and just buying one (I have one if you want it, I switched over to rollers).

Look at KK site for a good infographic on how to measure: https://www.kurtkinetic.com/thru-axles

I bought that set from Wahoo and thought it was a ripoff.

To use it, you have to install a different cup on the trainer, so if you have a bike with through axles, and one with QR (like me, haha!!) it’s a PITA to switch. I sold it on eBay.

I went with a Robert Axle Project axle. Beautifully made. Fast shipping.

https://robertaxleproject.com/

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You will never, in your life, have a chance like this again.
If I were you, I would not pass this up. I would not let this go by...this is rare.
Come on...what harm??