Lucky you, that is an adjustable thermostatic choke.
Now the next step is to put it back into place and see if you can pull up on the rod.
If you can pull it up to a position that will close the choke,
You will need to remove it and adjust the thermostatic coil.

If not, the rod is too short.
You might be able to gain the needed length by straightening some of the offset bends providing it does not lead to binding
OR
you will need to find the correct one or fab one up