I used to sell Code 3 LP 6000 rotors to a city 10 at a time. I once delivered them in person and seen a DPW radio guy gutting Twinsonics and installing the LP rotors in them and replacing the domes with Amber. I asked the director if we could work out a trade for some rotors in exchange for the Twinsonic parts. I would have discounted the rotors for the parts on the invoices. He literally told me to go F' myself. I never got the parts and the next time I seen him, he was driving a sweeper. The new director was really nice.
They were all done :-( Due to a union issue, we lost the police vehicle contract so I had no reason to go out there anymore, I never did try to recover the converted Twins. Their radio guy - who would spend 30 days upfitting a single vehicle - filed a grievance because he thought he was going to lose his job.