Where can I get a tray loading External CD-ROM Drive SCSI 25pin for my Color Classic?

I got the Applecd 300 SCSI 50 pin CD-ROM Drive, but it has no caddy! Is there caddys online for this? I don't want to damage my new 7.6.1 CD with it.

I really rather just get an external SCSI CD-ROM Drive with a tray for it though.

Any help would be appreciated thanks.