Don't even bother. Will achieve precisely nothing (especially if your modified) mainstream insurers don't have a foggiest what they're doing with Imports. If you want to get a feel PM Neil at Greenlight to give you an estimate.
I'd be extremely vigilant when getting a quote from any online source, as most often the model covered is not a DC5. For example I've just run one through using my FD2 and it comes up as a UK 3 door car. Admiral gave me a quote for my DC5, but when I looked into it they had it down as a UK DC2. Admiral are also horrendous to deal with if in the unfortunate event you have to.
in my experience all insurance companies are excremente to deal with when it comes to them having to pay out, unfortunately insurance is just a necessary evil which we all need for the paperwork, mine was with admiral only a few weeks ago, my online quote was listed as "2.0 TYPE R DC5 IMPORT" and they were cheapest by a long way even compared to the so called "specialists"