Replacement part information can be found in the user manual, but here is some info about the probes:
Probe tips: The rigid tip (gray tip) is pre-installed on the TPP0250 probe. The pogo tip (white tip) is pre-installed
on the TPP0500B probe, and is spring-loaded for compliant testing of circuitboards. Reorder numbers:
206-0649-xx (rigid tip)
206-0650-xx (pogo tip)
If you are interested in placing order or parts pricing, please reach out to our sales at 1.800.833.9200 option 1 or email the request to buy@tektronix.com.