Hi Fred.
It is a pity that you did not ask about this burner first, but even then I would have been unable to reply in time being in internet-less Aberdeen.
Unfortunately these burners require some serious surgery to your loco that I would not recommend. I've not got one, or even photos of one fitted (although seen one fitted on an ebay loco some time ago).
It requires you to cut off the rear chassis frames to allow the tank to fit under the cab floor, and I think it is held in place with the clip on the front of the tank going underneath the brass rear boiler cover where the combustion chamber has been bent horizontally to allow a solid fuel burner tray to fit.
Your posting has highlighted the fact that I've not posted a topic in this Forum (have done on the other Forum) on the various burners available (I've 3 different Meths Burners & 2 different Gas Burners).
The Meths burner I would recommend is the IP Eng one, as fitted to the IP Jane, but these usually go for almost new price on ebay. It has now been remarketed by Dream Steam -
http://www.dream-steam.com/upgrade_parts.html 2nd item down, which is a better package than the same burner sold by PPS.
The one sold by Chasteam & Forest Classics has a design fault which makes it a worse burner. I'll try and get a burner comparison topic done at some point.
Sorry it is bad news I've posted this time. I’d stick it back on ebay with some careful wording in the listing to get some money back.