Prize Boat Question

Don't know if anyone here can answer this, but here goes.

My friend Koby Kreiger won an Everstart tournament on Lake Eufala today.
Included in his prizes is a certificate redeemable for a fully-rigged Ranger
519, Evinrude or Yamaha motor, & trailer. I'm unsure of the hp of the
motor, but I gigure its probably 150-175, 200 at the most.

Koby is willing to sell me this certificate.

My question is this: If I buy such a certificate & take it to the local
Ranger dealer, is it possible to upgrade (pay the difference) to a 520 or
521, and a 225 or 250 outboard? Or is the certificate only good for the
specified prize boat? Anyone ever encountered this situation before?

I can get the cert for a very good price, but it won't do me any good if I
can't buy the upgrade.

thanks,
Warren

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http://www.warrenwolk.com/