Olivetiger wrote:

https://im1.shutterfly.com/media/47a5ce07b3127cceea20d15d36f400000030O00BauWLRu3cuAe3nwM/cC/f%3D0/ls%3D00809774195020151026211938402.JPG/ps%3D50/r%3D0/rx%3D550/ry%3D400/

I'm not sure if the URL will show the picture of the Sears Citation Ribbon Cartridges.  In the typewriter's manual it says to slip in a new Easi-Load Cartridge Ribbon and the Catalog Reorder number is 3740 for Sears.  In the manual there is an option to Change-A-Type.  It says... With Change-A-Type you can add special symbols and characters to your typewriter in seconds.  Just take the Change-A-Type slug off and slip another one on to adapt your typewriter to specials needs.  You can order five Change-A-type kits, each kit contains four types (eight characters).  

Also on this typewriter the Platen is removable.

I think that's all true. The white ribbon covers are just that---covers over ordinary ribbons. They might be sealed, though, and that makes them seem special. Regular ribbons will work. Keep the white covers for their unusualness; maybe they'll even fit easily over the new spools. They sure look nice in that white typewriter, even if we can't usually see them.

Change-A-Type---yeah. You'll find out more about them as time goes on. You don't need them to use a typewriter.

Similarly with a removable platen---not much need for that. Makes cleaning a trifle easier, getting it recovered a bit easier. In the old days you could get special platens for special purposes, but that couldn't have been a big deal for this model and you won't find any of them nowdays anyway.

Just write stuff.