Juz to share my experience..
Mine started with the 'metal type plate number'..being stopped at road block..
had to go for inspection before can pay summon..
but before i proceed to Padang Jawa JPJ,i had my tinted windows and exhaust pipings swapped temporarily with another car..(make sure there's no sand-blasted plate number)
as for your case,you can avoid the summons if there's no photographic proof...
if its an inter-changeable things,i dont mind to spend few quids on labour to swap 'em..
believe me,when you're there,those pricks will try to find fault on anything else....there's no way i'm gonna spend extra money for the govt...
good luck mate!