One or the other of these may help you as well, although it sounds like a generic IC of the appropriate pin count and change the labels with parts editor may be all you need.
(Edit: November 2016: This is an updated (and corrected) version of the original parts creation howto. This version corrects some suggestions (mostly saving Inkscape files as optimized svg which turns out to cause other problems) with the first version and expands the section on parts testing. While there doesn’t appear to be a lot of interest in this subject I’ll make at least this update so the information is as correct as I can get it.)
This is a description of how I made the Valor PM6078-00…
Fritzing Part Creation - Chapter3 - Inkscape Advanced Essentials
Learning how to draw in Inkscape - more features.
0:00 Overview
0:16 Select object with cursor and XML Editor
3:34 Manipulate special PDF’s in Inkscape
4:33 XML Editor - Direct drawing manipulation
6:05 XML Editor - Making group, moving object, changing layer height
7:27 Cursor - Changing layer height
8:21 Ruler
9:07 Grids
9:28 Snap selection
10:16 Drawing origin
Peter