@SteamTrain
Thank you, with the link you gave me, I was able to then link to:
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/car-registration-...
The Intuit/TurboTax chart that showed which state(s) and their specific fee(s), that Federal taxes actually allow tax deductions of their vehicle registration fee(s). And for Montana, the chart said the only vehicle registration fee that is deductible on my federal taxes is - "The County Option Tax you paid on your vehicles".
