Keyed spacers can be used to change 4-link centers and/or housing width on modular housings. This 3.437" spacer is an example of the custom width spacer we can produce. We have made spacers up to 7” for special width applications. These custom spacers can be used between the housing and 4-Llink Brackets or after the 4-Link Brackets and End Bells. The custom spacers Requires longer studs to be used. Our technical representative can help determining what widths will work for your application. Call 800-525-1963. Priced per application.