Adding second neutral bar to old panel

[ForbiddenDonut]

Hi,
My home has a decades old, 40-circuit Murray main panel, which unfortunately only has somewhere around 20 positions in the neutral bus. This is a problem since this is considered a subpanel as there is a main disconnect upstream near the meter. The grounds and neutrals are separated but the neutral bus has several double-tapped neutrals with no open positions to use to separate them.
My question is, can I add something like this (https://www.homedepot.com/p/Siemens-Insulated-Ground-Bar-Kit-14-Position-ECINSGB14/202315416) to clean up the neutrals? If I have two insulated neutral bars, what is the appropriate way to bond them together?

The only reason I'm concerned is because I just added a subpanel to my detached garage, fed by this main panel, and am planning on having it inspected in a few weeks. I imagine the double-tapped neutrals in the main panel are fair game and could cause me to fail the inspection..?

 

[Jraef]

I am closing this thread, in accordance with the Forum rules. This Forum is intended to assist professional electricians, inspectors, engineers, and other members of the electrical industry in the performance of their job-related tasks. However, if you are not an electrician or an electrical contractor, then we are not permitted to help you perform your own electrical installation work.


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