Cusser
+1y
Were there adapters for this shift knob? Maybe it was SAE thread and your Mazda is metric.
I have a standard shift knob available (5-speed, gray), PM with offer if interested.
If you want to use what you've got, you need to get an adapter, or lube up the knob threads and try JB Weld. But even with the lube, that JB Welded knob may end up being permanent.