Sill to 'B' post Reinforcement Left hand and Right Hand for TR4, 4A. This 'top hat' section shaped plate along with flat plate 611570 is welded to the sill and the 'B' post on the seam so that that the furflex can run from the sill to the 'B' post. On these cars the door seal follows another route, in a channel on the sill and the 'B' post.

The right hand side of the car used an opposite handed reinforcement or 611572 but as there is no discernible difference between them 611572 is now superseded to 611571.

It is worth noting that Triumph carried the part numbers and drawings for the the TR4 and 4A strengthener over to the TR250, 5 and TR6 parts books which are completely wrong for the later cars and will not work at all. This spectacular mistake was carried on right through to the 1974 TR6 parts book thus perpetuating the error for a full 8 years.  

For reference the incorrect part numbers in the TR250, 5 and TR6 parts books are 611570 for a flat plate and 611571 and 2 for the LH ans RH 'top hat' stiffeners respectively.

This part appears on the following Triumph Catalogue Plates