Electric motor for 4 Stroke Flathead Boxer Engine+Constant Mesh Two Speed Gearbox

I've created this holder, to look like a cooler for great models of @Bootjevaarder:

• https://www.printables.com/cs/model/379935-4-stroke-flathead-boxer-engine 
• https://www.printables.com/cs/model/144943-constant-mesh-two-speed-gearbox

Easy to print, need some screws and glue to assemble. I've used two switches, to allow change motor direction, for power I use 9V battery

Electrical motor: 4 pcs TT Motor DC Gearbox Motor Dual Shaft 200RPM DC 3-6V Gear Motor for DIY Smart Car Robot - https://www.amazon.com/MELIFE-Motor-Gearbox-200RPM-Arduino/dp/B096ZZHJW9/ref=sr_1_52?crid=3JS7AM4BU6NQB&keywords=6v+motor&qid=1668521197&sprefix=6v+mot%2Caps%2C264&sr=8-52