I had two of my four Mac IIc* machines have bad speakers. And the speakers in them are off, rectangular shaped speakers. I also had a bad speaker in my Mac II (which made me think for the longest time I wasn't getting a boot chime or sad Mac chimes) and found a decent replacement on Amazon. I found these 32 Ohm 0.5W speakers that were smaller than the originals: https://www.amazon.com/dp/B08264R7Z4?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_4. So I built a little adapter to make it fit for the original Mac II speaker.
With the rectangular shape of the Iici/IIcx speaker, I needed a new adapter, so I whipped this up in TinkerCad. The original speaker friction fit with the rear bump out behind the cone, but the new one doesn't have that. So I just made it fit inside the bracket, and taped the adapter in place. Non-destructive, and effective for something that will likely never be seen.
You can find the 3d files here: https://www.thingiverse.com/thing:6961841
But also attached to this post.
With the rectangular shape of the Iici/IIcx speaker, I needed a new adapter, so I whipped this up in TinkerCad. The original speaker friction fit with the rear bump out behind the cone, but the new one doesn't have that. So I just made it fit inside the bracket, and taped the adapter in place. Non-destructive, and effective for something that will likely never be seen.
You can find the 3d files here: https://www.thingiverse.com/thing:6961841
But also attached to this post.