The most common ones used are the Dejan type (LPT port) for Nokia, the connectors are fiddly so it is easier to buy rather than make as you don't want it to drop off in the middle of an unlocking <img src="smile.gif" border="0">
Try here:
<a href="http://www.divineo.co.uk/cgi-bin/div-uk/index.html" target="_blank">http://www.divineo.co.uk/cgi-bin/div-uk/index.html</a>