The TP-VR series of sealed DC to DC regulators offer high output regulation in a compact sealed enclosure. They have 12" long 18AWG leads on input and output for universal connectivity.
WARNING: Products made with PVC can expose you to chemicals including DEHP, which is known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov.