Populate Multiple Fields from Mutiple Column Listbox

Hello all i'm a novice at Excel, I have dabbled in VB and Access in the past with Access 2000. But that was a while ago and I'm really rusty. I have a small project that I'm working on for my Engineering Department. I'm trying to create a Thread Height and ChamferØ Calculator.

I attached what I have so far. The Yellow feilds are calculated fields and do not need to be changed. The Light Brown fields are the feilds that need to be populated from the table on sheet "ust" (Unified Screw Thread). The White feild is a hand typed field that we get from our catalog


The List Box needs to be populated with Multiple Columns from Sheet "ust" columns B2:B671 and D2:D671

I have tried to figure this out for the last few days but have run out of time and need to finish so I can get back to engineering. If someone would help me I would be in your debt, maybe I can engineer something for you for your time. Any help is greatly appreciated.

PS I will try and tackle the Metric tab after I get the Inch working which is the majority of my work.