I have Hagerty for my classics and I just enter in a value for how much I want the vehicle to be insured for and they do it.
I have similar coverage from Farmers but, you have to keep in mind their "replacement clause"
Copied from the policy (see bold print)-
1. The definition of your insured car is changed to mean; only the vehicle described in the Declarations.
2. Use of your insured car will be principally for exhibition, club activities, parades or other functions of public interest and occasionally
for other purposes.
3. If Coverage is written for damage to your car under Part IV of the policy, the limit of our liability for such damage shall not exceed the
lesser of the following amounts:
a.
The amount which it would cost to repair or replace damaged or stolen property with other of like kind and quality; or with new property less an adjustment for physical deterioration and/or depreciation.
b. $11,000 The Premium Determination Amount.
This amount is used to determine the premium. It will not set the value of the property for purposes of loss adjustment. It limits
our liability.
Caution: It is important that the Premium Determination Amount be kept up-to-date. It should be changed if the value of your
insured car changes. Please advise your Farmers Agent if there is any change in this amount.
SO, I have a folder with everything I bought and installed on my truck. HTH