Bit for Sears Router

Welcome to the forum what part of the country are you in ?
I'm thinking it only takes a 1/4" shaft bit which is available at most box stores and online.
Just in case you don't have it, attached is the PDF owner's manual.

G'day @awmanier , welcome to the forum.
Thank you for joining us, .

You will find many on the forum, from hobbyists
to professional with similar interest in the router and its uses.
Take the time to learn how the forum works and ask any questions you want.
Try to post your question in the most appropriate section as not all members
read the Introductions section.

The members are only too happy to help.

@awmanier Glad you joined the fun. Definitely will be listed in the manual. Generally I go with Freud, either in stock at HD, or on order from Amazon. Be sure to order shank size recommended. Metric sizes won't work in an imperial collet and vice versa.

Welcome to the forum @awmanier