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U can try ledbulbs.co.nz
They have most size dash bulbs
From memory it's a d8.5 or an e 10. I might be wrong on that

Nice fish, everything got a price...
I'd just splice in, using a Haynes manual to follow wires , if u can find a 2nd hand loom , u can replace the whole thing , but u gonna find u still will have to...