I have the main section of a soil shredder ( no grill ) for a Howard Gem which I may be disposing of shortly what neck of the country are you ? also have a roller from same machine Dave
I would not bother I made enquiries about a plough for a Howard Dragon in 2017 still waiting for reply after many phone calls and letters. Many years ago I ordered a drive shaft for a Bullfinch he cashed cheque no part came only way I got it was after solicitors letter and I am not alone
your tyre fitter is talking rubbish I get my tyres from China Parts at Burnopfield, co Durham who do an excellent mail order and they are very close tread pattern and have no problem fitting myself