I don't understand what you're saying. There were only 500 USA sold 2006 Spec Bs. Why else would there be a numbered placard?
"GT spec.B sedan adds over GT sedan
spec.B GT photos
spec.B speed test below
Limited to 500 cars, each with a numbered plaque"
"If you're planning to buy this special Subie, as with any car, waiting until you can find a slightly used example might be a wise financial move. Then again, you may not have a choice. Subaru sold 160 copies in the first couple months the spec.B was on sale, so there may not be many of the 500 left by the time you read this. "
"Here to help us get over our loss, however, is the limited-edition (only 500 examples), Legacy GT Spec B sedan."
"Subaru of America, Inc. has introduced the Legacy 2.5 GT spec.B performance sedan and will offer just 500 of these special cars for model year 2006. "