Differential cross sections for exclusive $\gamma \gamma \rightarrow \mu\mu$ production measured by ALICE in p$-$Pb UPCs at $\sqrt{s_{\rm NN}}$ = 8.16 TeV, as a function of $M_{\mu\mu}$, for $2.5 < y < 3.25$ (left) and $3.25 < y < 4$ (right). The vertical error bars represent the statistical and systematic uncertainties summed in quadrature. The results are compared with the prediction from STARlight and from SuperChic.