Trev. I have been very busy doing bits & bobs and have not had time to get you any costs as yet but I have a Indian tank that I bought from Pummy on flee bay, for my 1956 A7 s/a, he wanted £250 or offers so I stuck to my guns and got it for £200 inclusive of p+p the quality is very good painted and chromed, badged with knee pads, fitted straight on to my A7 with no problem, just had to tap out the threads on it as there was a load of crap in them, I really think you should try this chap, it would be a lot less than I would have to charge you but if your still interested, let me know.
Kind regards TTJohn