question - beseler 23 negative holders

Hi - I have an off-brand enlarger that is missing some negative carriers. I looks like a negative carrier for a beseler 23 might work depending on how large the diameter of that indexing circle is on the bottom of the carrer (the enlarger I have uses a similar system of registering the carrier to the enlarger). It would be greatly appreciated if anybody could measure the diameter of the indexing circle and share it with me.

Thanks

4 3/4 inches or 12 cm