long part numbers, Letter paper size

[Joseph <..hidden..>]

1.) Does anybody know how to modify tex-invoice template so it wraps a long part numbers the same way as html-invoice when printing to the screen?

2.) How to adjust the tex templates for letter paper?
Here is a typical header:

<?lsmb FILTER latex -?>
\documentclass{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{tabularx}
\usepackage[letterpaper,top=2cm,bottom=1.5cm,left=1.1cm,right=1.5cm]{geometry}
\usepackage{graphicx}
 
letterpaper is not producing Letter paper size, it is asking for A4 paper.

--
Joseph