Searching for split spindle for NAMI patio door- I think it is the 120mm long one, by 7mm??

Thank you for reaching out to us. We have the 40-038 storm door handle spindle but it's not split like the one shown in your photos, unfortunately. Contacting the original manufacturer of the door may be your best bet. I am very sorry that we cannot be of more help. 

I'm afraid NAMI isn't the manufacturer. It's just the company that certified the door.