I've been to Home Depot in Oregon City, OR and W.C. Winks on SE 2nd. in Portland, OR.
Measurements as best I can determine:
roller: 1 1/8" x 4.5/16"
housing length: 3 1/8" (-) x 5/8"
maximum length of housing to end of raised roller: 4 5/16"
housing height: 1"
Dwayne
