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That is the one with the brass disk at the screw which falls out of the endpin is removed. 5/8” diameter.Some people prefer wooden endpins due to a possible contribution to tone; I wouldn't be too quick to replace it unless you know you'd prefer something different.
If it were me, I'd just remove the metal crown completely and put a black rubber cane/crutch foot on it. They come in a number of inside diameters and they last a long time.

Use some "Lock-Tite" to lock the threads, that should help keep them from vibrating loose!My current bass has a very similar one. I've found that some cello endpin tips fit, but wear out quickly. I prefer this one made by Wolf:
Super Endpin ball attachment for Upright Bass (tip, cover)
These have been lasting about a year for me, so you shouldn't have to replace it too frequently. The only issue I've had is that you need to keep the set screw tight, or it will fall off.
Unfortunately the endpin ball from Gollihur (mentioned above) won't work for this diameter endpin.