Call/ email this vendor with your question and dimensions.
No affiliation
https://www.automotiveauthorityllc.com/products/spare-wheel-and-tire-kit-for-2015-2017-ford-mustang-gt-with-brembo-brakes?gclid=EAIaIQobChMI2cCFuIDV_QIVdRvUAR3fxQH3EAAYASAAEgJ_NfD_BwE&variant=3892365951003#google_vignette
No affiliation
https://www.automotiveauthorityllc.com/products/spare-wheel-and-tire-kit-for-2015-2017-ford-mustang-gt-with-brembo-brakes?gclid=EAIaIQobChMI2cCFuIDV_QIVdRvUAR3fxQH3EAAYASAAEgJ_NfD_BwE&variant=3892365951003#google_vignette