Swisco,Need sliding window roller assembly.

Need sliding window roller assembly.
No part #, or manufacturer. Homw was built in the mud 1980s.
Brass wheel;
Flat 1/4" dia, hub and wheel are 1/8" .
Plastic case is;
7/8" long x 1/4" wide at the bottom.
13/32" tall. Top w/ flange is 7/16" wide.
Slot in the middle where wheel rides is1/8".
See the pics.
Got anything like this?