Editing Triumph TR7 (section)

===Revisions===
[[File:TR7 Broadcord interior.jpg|left|thumb|TR7 broadcord interior. (Lack of lights in driver's door)]]
[[File:TR7 Sprint interior.JPG|thumb|right|Green tartan interior (with US spec. steering wheel center)]]

The interior trim was revised in March 1977, with the broadcord seat covers being replaced with red or green "tartan" check inserts with black leather effect vinyl edging. The tartan trim is also reflected in the door cards in padded matching red or green tartan cloth inserts in the black leather effect vinyl.<ref name="Piggott 2009"/>

The development of the convertible version of the TR7 required the interior light, which was in the headlining, to be removed. This was replaced by lights with integral switches in each of the door cards. A map light, mounted between the seats on the back panel below the rear parcel shelf, was deleted. The convertible also required a smaller fuel filler cap, as the deck area in front of the boot lid was reduced to allow for the stowage of the hood. These modifications were also applied to the hard top for the 1978 year model (starting after the factory's summer shutdown in 1977),<ref name="Piggott 2009"/> presumably to maintain commonality of parts on the assembly line. The wheel trims were also changed at this time, from smaller black trims that covered only the centre of the wheels, to larger silver ones, covering the whole wheel.<ref name="Piggott 2009"/> 

External decor changes included simplification of the TR7 badge on the boot, the rear panel changing from black to body-colour, and the TR7 nose badge being replaced by a large laurel-wreath emblem with the Triumph name across its centre, this latter replaced on final production models by a small circular raised badge. Only a small number of 1978 year model cars, with the smaller filler cap and lights in the door cards, were produced at Speke, due to the industrial action there in 1977–78.<ref name="marren2009"/>

[[File:Triumph TR7.JPG|thumb|left|Solihull-built TR7 drop head coupe with double bulge bonnet]]
[[File:TR7 tan plaid interior.jpg|thumb|right|Tan plaid interior of a Triumph TR7. Note later rectangular door lock button at top left.]]

The development of a V8-engined version, which became the [[Triumph TR8]], required an addition bulge in the bonnet, to clear the carburettors. This produced the "double bulge" or "double bump" bonnet, characteristic of TR7s and TR8s built at Canley and Solihull. However, at least some of the TR7s built at Canley have single bump bonnets;<ref name="Piggott 2009"/> though it is possible these were cars that had not been completed at Speke, possibly due to the industrial action there,<ref name="marren2009"/> and finished off at Canley after production was moved.

During production at Canley, the seat trim was again revised, with a plaid cloth in navy blue or tan, with matching coloured leather effect edging, and matching door cards.<ref name="Piggott 2009"/> A further trim change during production at Solihull saw the use of a [[ruched]] velour in blue or tan on the seats, with matching inserts on the doors. Also, the internal door lock buttons were changed from the earlier standard BL round ones, to rectangular buttons held on with small grub screws. There was also a change to the trip mile counter's reset button,<ref name="Piggott 2009"/> which became a push type operated through the instrument "glass", rather than a turn type under the dash.