if rear u can get one from zipp kits or try glenn quarles,,here on the board,,he is a novarossi dealer.... another option is search tower hobbies site...
It´s a rear engine but a .21 header won´t fit.I will contact Glenn and see if he can help me.I´ve searched the tower hobbies site but the only one i found is from o.s and wil cost 43 dollar.I´m crazy but not stupid