dishwasher detergent pods were widely available for standard-sized dishwashers, typically 24 inches wide. However, dishwasher detergent pods specifically marketed for 18-inch dishwashers (which are smaller and more compact) were not as common.
It's possible that new products have been introduced or changes have occurred in the market since then. To find the most up-to-date information, I recommend checking with local stores or online retailers that sell dishwasher detergent pods and searching for products specifically designed for 18-inch dishwashers.
Additionally, some manufacturers may provide compatibility information on their websites or packaging to help you determine which detergent pods are suitable for your particular dishwasher model.