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Some more obvious identifying features are the bonnet and boot badges and the wing top mounted sidelights. Originally the front grille inserts were painted Silver.

The Type 403 was initially fitted with a more developed Bristol 100A series engine, but later cars were fitted the more advanced 100B series unit - which was inevitably itself further developed, as the 100B2 series and was combined with a remote short shift gearbox with Laycock de Normanville overdrive on top gear. This was fitted as standard on the last few Type 403 models. The more powerful transmission package was later to be fitted as standard on the Type 405 Saloon.
Many early Type 403 cars were so modified and these engine units are identified as either 100AB series or 100AB2 series units according to specification.
Because of the increased power from even the base level 100A series engine unit, an Anti-roll or Sway bar was added to stiffen further the front suspension.
The brake linkage was modified to reduce pedal pressures required and Alfin Brake Drums were fitted initially on all four wheels, but later only on the Front wheel units, the extra cooling on the Rear Drums having proved unnecessary.

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This Type 403 clearly marked by the Bonnet and Red coloured Wing Flank Pegasus Badges has the original style Silver painted inserts to the Chrome trimmed BMW styled Radiator Grilles. Note also the additional but discretely camouflaged twin horizontal air intakes at mid Bumper level introduced on the Type 401 and retained to the Type 403.