No you haven't made a mistake
Ok unfortunately i did not know that led's needed dc so i think I have made a mistake I did ask I was told they would be a direct replacement ,this is the ones i bought
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a direct replacement.
The 4th mini-picture (underneath the main one) is the schematic diagram.
It shows that within each bulb there is a bridge rectifier (the 4 diodes in a diamond shape).
That rectifier converts AC into the DC that the LEDs require
(the arrows coming out of the other 4 indicate that they are the actual L
Yes, they're quite expensive, but they use a lot less power, run cooler and (should) last much longer than filament bulbs.
To avoid bright spots from each of the 4 LEDs showing through the dial, you might just need to rotate the bulbs in the holders - to obtain even light diffusion.
Have fun, should look good