Does anyone know if an 87' burb power tailgate motor and regulator will fit in a 90' blazer tailgate? The burb unit is a direct drive unit, where as the blazer had a cable driven unit. Can you exchange the entire regulator assembly or not? Any help would be appreciated. Thanks, Mike. 77' 3/4 ton Burb, 400cu, sm465, np205, 14boltff, dana44, 4.10s, 36 inch cepeks.