Here is a Dale RH-25 resistor. It was modeled after pictures of the original part from the 80's. It is a bit of a hybrid between the Dale 25W and Sage 25W resistor. It was difficult to find dimensions for the Dale part.
There is a hole on one end of the model that will accept a 1/8" OD hose. The mounting holes will take a #4-40 cap head screw. The fit may be tight.
The final part was lightly sanded with 400 grit sand paper and given two coats of Krylon matte black paint. An additional 2 coats of clear coat were added. Once dry, the clear coat was lightly sanded with fine grit sandpaper to dull the shine.