Need to access old admin panel for registrar customer #

I recently transferred my blog to www.ads-software.com using godaddy. I have complete access to my new admin panel as I’ve switched the name servers to godaddy’s but I would like to update the MX records because when I switched name servers my email I set-up through google apps stopped working.

I originally updated the MX records in my old wordpress.com blog so I could use my @sitename.com emails set-up through google. Now I can’t access the old admin panel (wordpress.com) to find out what my customer # was for logging into wildwest domains. Any ideas on how I could retrieve this information?

Also, if I wanted to renew my domain that was originally set-up through wordpress.com (wildwest) I would probably need this login information. Any help would be appreciated. Thanks.