The M-R-S A-105 is a four-wheel drive (4WD) tractor produced by M-R-S from 1964 to 1967. It was built in Flora, Mississippi, USA. The tractor features a Detroit Diesel 7.0L 6-cylinder liquid-cooled diesel engine, mechanical 4x4 drive with power four-wheel steering, and an open operator station. It has a wheelbase of 118 inches, height of 119 inches, and weighs 33,000 lbs. The tractor rides on 24.5x32 tires front and rear.