Product review (4 stars): Good price.  Nice to have it available here.  Not entirely universal - wasn't suitable for my older machine.
We had an old stacking Frigidaire washer/dryer.  I love that these are available on Amazon.

What we really needed was "<a data-hook="product-link-linked" class="a-link-normal" href="/Frigidaire-Washer-Dryer-Control-Knob-131858004/dp/B002ZNLK4K/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Frigidaire Washer/Dryer Control Knob 131858004</a>" - to save twenty dollars we tried this somewhat-universal appearing knob first.  This knob is not compatible with old machines that require the knob that I needed.  Just wanted to post so others with my old machine would know this won't work for them.