Will a rear brake caliper from an 84 Goldwing gl1200 fit an 83 gl1100?

No, a rear brake caliper from an 84 Goldwing GL1200 will not fit an 83 GL1100. While both models are part of the Goldwing family, they have different mounting configurations and hydraulic specifications. It's important to use parts that are specifically designed for each model to ensure proper fit and function. Always consult a parts manual or a trusted mechanic for compatibility before attempting a swap.