Hi Poandneedy,
As far I know nobody makes a 1/32 80hp Le Rhone engine but Vector makes the 110hp version, perhaps you can use the cylinders or convert it to the 80hp configuration (exhaust in front). Here is the link:
Vector Scale Resin Model Engines
Or try to contact Special Hobby, they have and excellent customer service department, maybe they can send a replacement engine.
Cheers,
Claudio