These custom deep drawn oil tanks are handcrafted from 16 gauge steel and feature a battery box for Softail style batteries. They take 3 1/2 Quart (3.3L.) of oil and 1/8" NPT oil line fittings and come with a chrome plated cap. Tanks are 6 1/2" (16.5cm) in diameter and 11 3/4" (30cm) in width. They have gap concealing wings left and right and come in mirror chrome or ready-for-prep-and-paint raw steel. Available with equal length wings for stock Softail, Kraft/Tech Softail frames thru 180 rear tire, most aftermarket Softail style frames, and rigid (hardtail) frames for Big Twins. Also available to fit our Kraft/Tech Softail style frames for 200 thru 250 series rear tire, these have unequal length wings. All tanks fit with a stock Softail-style rear oil tank bracket.