Abstract: A mounting assembly particularly adapted for mounting a replacement alternator of the type having a pair of lower mounting lugs onto a pair of spaced mounting lugs of an engine block. The mounting assembly comprises two portions one adapted for connection to the alternator, and the other having a pair of brackets to provide fixture to the mounting lugs of the engine. The spacing between the brackets is adjustable by means of slidable arms to facilitate attachment of the assembly to various spacings of mounting lugs. The assembly can also provide pivotal movement between the alternator and engine by adjustment of the one portion.