The Roadmaster EZ Base Plate Kit, part # 521228-1, you have referenced, are the correct base plates for your 2005 Volkswagen Jetta Old Body.
If you have a Roadmaster tow bar like the Falcon or the Blackhawk you will be able to tow the Jetta if you have the Roadmaster Quick Disconnect Tow Bar Base Assembly, part # 910021-00. This is a support bar that will span between the tow bar arms and connect to the tow bar and includes a set of quick disconnects for both the motor home and the Jetta.
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