couple of threads on here, cylindrical tank in the boot is the only way to go on our cars.

https://www.two-sixties.co.uk/mgoc26...hlight=autogas

https://www.two-sixties.co.uk/mgoc26...ead.php?t=6039

A few of the suppliers now offer the option to fit your own, in line with the lpga installers cose of practice, and will set it up and certify it for you.

I would do it tomorrow if the mileage I do justified it.