As of December 2017, the Vinyl Cleaner PRO from Audiodesksysteme Gläss (Glaess) contains the preparation for the 7"-upgrade-kit, which can be ordered separately (https://www.gp-audio.de/Audiodesksysteme-Glaess-Glaess-7-Single-Upgrade-Kit-for-Vinyl-Cleaner-PRO.) and with which even 7" vinyl records / singles can be cleaned with the Vinyl Cleaner PRO.
All Vinyl Cleaner PRO ordered from now on include this preparation.
When ordering the Vinyl Cleaner PRO at https://www.gp-audio.de/Vinyl-Cleaner_1 you have the option to order the device without or with 7"-upgrade-kit.