41-E trucks for early lightweight passenger cars.
This model represents trucks with ASF roller bearing axles. These came with bearing-carriers that resembled the journal boxes of plain-bearing axles.
Bolster pin diameter: 1/8"
Bolster bearing surface: 3/16" above the rail
Wheels: BLMA 36"(alternate wheels: any with .54" axle length)
Screws: 2x4mm self threading (Kato 900020)