I purchased this stove in January 1996. Serial number is WH 511. Local dealer gave me a parts list for an Invincible "T" but I have my doubts since this doesn't seem to be an fireplace insert. The picture attached is from the front page of my owner's manual. The notation at the bottom right of this page is R4. Any one know how I should refer to this model and where I can get the appropriate parts list for this stove?