Quoted from ralphwiggum:

You can replace the heart with anything you want. The originals rotted and there arent any replacements that are factory.

I know the game intimately, have had one for 8 years after bringing it back from the dead-

https://picasaweb.google.com/114677989241940608218/ClassOf1812?authuser=0&feat=directlink

I have the original heart in decent shape and a repro hand from PBR.... Also put in all new ramps, the game isn't going anywhere, it is my wife's favorite, and it is a guilty pleasure pin. It isn't a deep game to play, just a "charming" game to play.... Audio and art is fantastic...