This build your own narrowed adjustable beam kit comes with all the essentials to narrow your stock beam. Combined with your stock beam and some elbow grease you can build up to a 5 inch narrowed beam. WARNING this is to be done by a professional! Included are side plates, adjusters and bushings. Please select the year of your bus and what style side plates. We now offer 1968-79 BYOB kits for new 120 wall tubing, if this is your choice below you may also want a pair of larger center blocks.