For your 1997 Roadtrek 170 Dodge, a 25-gallon greywater tank specific to your model is recommended; however, availability can vary, so checking with specialized RV parts suppliers or using tank finder tools is advisable. Regarding the Manchester propane tank model 675374, this is a 10-by-23-inch ASME permanent-mount RV propane tank designed to mount to the frame. Unfortunately, Elkhart RV Parts does not currently have this exact tank in stock. While a similar Manchester model 6813 exists with comparable dimensions, it is not guaranteed as a safe replacement due to differences in mounting brackets, valve arrangements, relief valve orientation, fittings, and chassis clearances. It is critical not to replace propane tanks based on size alone due to safety considerations. The best course of action is to contact a Manchester distributor directly with the part number 675374 to inquire about a current factory replacement or obtain detailed drawings. Before installation, have a licensed propane or RV LP technician verify compatibility, including mounting geometry, fittings, capacity, and clearances, to ensure safe and proper installation. For further assistance, you can utilize Elkhart RV Parts' tank finder tool and consult with professionals to locate suitable replacements.