EZ Electric Power Steering in Holland has an EPAS system designed specifically for the Pantera.
http://www.ezpowersteering.nl/...age/158/17/Home.html
The entire unit is installed in the upper column so your OEM steering rack remains unaffected. The EZ system is speed sensitive, so as speed increases the amount of assist decreases. If you have a pre-GT5S, EZ supplies you with a new upper column but if you have a factory GT5S, you'll probably have to send them your upper column for conversion (which only takes about a week).
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