Hello,
I'm assuming that you are looking for replacement hook tips. There is also a chance that you might be looking for the actual probe tip. Below I'll provide the current version of the part and also included a copy of the manual which shows the original replacement parts and numbers.
Hook tip:
013036201
Replacement tip:
206063501
Please reach out directly to our sales at 1.800.833.9200 option 1 or email the request to buy@tektronix.com. they will be happy to provide price, availability and take your order.