Group 5 Silhouette cars newer had specific homologation forms since they had to be accepted into Groups 1-4 to be allowed. As I understand it Zakspeed could have shown up with a Group 1 homologation form #5586 for an Escort 1.6, a Group 2 #1605 RS1800 or the Group 4 #650 RS1800. It was their choice and from then on it was a matter of reading and interpretading the Group 5 rules to build the best car possible.
Jesper
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