Vorsprung products are Canadian-made* and enter the USA duty-free under CUSMA/USMCA. The new Section 338 tariffs that came into effect on August 22nd do not apply to Vorsprung products.
That means the price you see is the price you pay - no additional charges apply.
*Sprindex/Telum springs are Taiwan-made, but are shipped DDP (Delivered Duty Paid) so no duties are charged regardless.