Scrounging around on the weekend and managed to pickup a straight RX125 tank. Doesn't have the key though so will have to see if I can pop it with a screwdriver. A locksmith crossed my mind but last time I had a quote of them they wanted my first born child as a down payment.
It's a shame I hadn't found this earlier else I could have used this on the legbreaker as it was in way better condition than the original.
Also picked up a set of bars, thought they may have come off a BSA or something of the similar era?