I just went through this a few months ago.
Progressive will allow you to add up to 5k in aftermarket parts coverage.
IIRC Travelers and/or Liberty Mutual will sell like 10k or 15k in additional coverage for aftermarket parts - but one of them will only insure you at all if all of it has been installed by a certified mechanic.
esurance has a partnership with Haggerty for custom and modified cars that I was looking into, but Haggerty has awful reviews.
I ended up going with MetLife, which does not have anything to offer for aftermarket parts coverage aside from a "We'll do our best to make it right" from the sales girl... which, to me, means no coverage... but in my case, the cost/year was almost $1500 less than other options so I chose to gamble on it.
edit: Sorry I could not be more specific on some of this, its off the top of my memory and I disposed of all of my notes that I used at the time.
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