Valve Guide Size

One of the valve guides on the 1981 380sl I discussed in an earlier thread is loose. So I'm getting the parts together to repair it.
My question is does it make sense for me to replace all the guides, and, if so, should I order all the guides one-size over or just the bad guide? Or, am I better off waiting to inspect the guides before ordering them?
Thanks very much for the info
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.