What is this 2x10 part with a center console and two holes? I am fairly sure this part is from earlier than 1990. On the bottom are the characters &quot;A&quot; and &quot;4&quot;. I checked Bricklink for yellow 2x10 parts but couldn't find anything. The 2x5 side with the cutout at the bottom is one level higher than the 2x4 back part.
This is
Part # 870 : Vehicle Tractor Chassis Base 11 x 2 x 3