Unsolved How to make a simple parts mod

I have quite a bit of 3D modeling experience and i wanted to make some sort of parts mod, could anyone help?

 

Here's the .dae file if you wanna check it out

 

You should know jbeam to get your part in-game. I'll check your file and try to jbeam it tomorrow, it's night for me
This part is for which vehicle btw?

 

So, i got help froma few people on discord, so it's all good, and its for the midsize

 

You mean, you don't need my help?

 

Hello...?