We have functionality planned for Item pages which would force the Part and Tool links shown on guides to open in a new window (either all of the time, or only if the Store link would take the user to a different base URL). We don't have anything similar planned yet for the Store link, but could implement it there as well.
For each of these examples, what are your thoughts on whether the links should always open in a new window VS only open in a new window if clicking the link would take the user off the site?