Check the listing for details. Conversion Kit from Alum Tube Quick Change to 5x5 GN Steel for IMCA Modified. Condition: New. Listed at 516.84 USD. Convert an Aluminum Tube Quick Change to 2.5" GN Snout Steel Tubefor an IMCA or UMP Modified and others 2.5" Grand National Tubes, nuts, seals and Solid Axles two - Centerless Ground Tubes for a 60" centered pinion quick change. 2.99-3.00" precision ground x .188" wall DOM Tubing. above tube snouts are plug welded for strengthtwo - 30.5" long wide 5 31 splined axles. two - GN Snout Right Hand Nuts for 2.5" GN Snouts (N-12 sized). two - GNSSW5 snout seals for above 5 axles. You will have to drill and tap the retainer bolts for the side bells after you install the steel tubes. You can request other track widths and offsets. Kit will ship UPS Ground or by SpeeDee Delivery in the Upper Midwest. WARNING: Cancer And Reproductive Harm- www.P65Warnings.ca.gov