Fits Caterpillar model C6.6 with the below listed pumps. There are two pumps that fit this model. The mechanical seal is different. This kit is the version that the seal seat is located in the bronze housing.
Here is a link to the version that the seal body is located in the bronze housing. You should see 4 options at checkout (just before you pay), the default may not be the best option.
Message me with your address if arrival is critical. Friday 4PM to Monday 4PM arrives Wednesday.