Briefetiketten mit scrlttr2

\ProvidesFile{labels.lco}
\LoadLetterOption{SN}
\@setplength{toaddrhpos}{72.0mm}
\@setplength{toaddrvpos}{42.4mm}
\@setplength{toaddrwidth}{68.0mm}
\@setplength{toaddrheight}{42.4mm}
\endinput

\documentclass[SN, foldmarks=off]{scrlttr2}
\usepackage{ngerman}
 
\setkomavar{backaddress}{Fritz Mustermann\\Musterweg 1\\CH-1001 Musterhausen}
 
\date{}
 
\begin{document}
 
\begin{letter}{Martina Musterfrau\\Musterstrasse 1\\CH-1000 Musterstadt}
 
\LoadLetterOption{labels}
 
\opening{}
 
\end{letter}
 
\end{document}