Triumph TR6 Rear Bumpers - European Models to CR5000 1969 to 1973
Up to early 1969, TR6s used bumper corners threaded for 5/16 UNF mounting hardware (the factory shows the chassis numbers CP26933/CC31776 as being the points when the more usual 3/8 UNF screws were incorporated). This would indicate that the earlier bumper corners were made to a different condition (and thus had different part numbers), but no change to the bumper corners themselves is apparent in any factory literature. However, if your car has smaller diameter fixings, the following four lines are the items to fix the bumper corners to the wings, replacing lines 25-28.
Alternative Fixing System
Fitting the rear bumper may be simplified by the use of studs and nuts in place of the bolts that attach the bumper through the rear valance (for the same reasons outlined in the paragraph in Front Bumpers). The following components are applicable to both pre- and post CR5000 models; i.e. they will replace items 18-20 or 53-55.