have a repro rear fender with a few too many holes.
Wondering if there are any hole pattern templates out there for vintage Tri fenders.
However, it should be relatively easy to ascertain 'correct' holes:-
. Start with the one at the front? Chances are dpo didn't put extra holes here and the hole's for a 5/16" OD bolt so larger than many of the others.
. Then two similar-size holes for 5/16" OD bolts should be one just in front of and the other just behind the middle of the rear frame loop; the bolts pass through the holes in the "Clip" that hooks over the frame tube and the flat "Backing plate" that's fitted on the inside of the fender.
. There should be a third similar-sized hole just to the right (looking towards the front of the bike) of the aforementioned bolt-hole just behind the frame tube. This hole isn't shown in the parts book picture but has a grommet as it's where the rear lamp wires come from the underside
of the fender; why this hole wasn't inside the frame loop under the seat is one of life's great mysteries ...
. With the fender located on its front mounting and its rear frame mounting, you should see the two holes that line up with what Triumph called the "Fender bridge", between the top shock. mountings. The parts book alleges the "bridge"-to-fender bolts are 1/4" OD but ime you might well find they're actually 5/16" OD.
Risking telling you something you know already, the "bridge" isn't symmetrical either side of its highest point - it's longer to the drive-side shock. mount than it is to the timing-side.
. The two rear "Lifting handle" tabs bolt to the fender with 1/4" OD bolts. Here risking stating the obvious, the "Lifting handle" shock. mounting bolts holes are slotted, so the "handle" can be moved backwards and forwards a little to align the rear tab holes with corresponding holes in the fender.
. With the "Lifting handle" in place, the standard rear lamp ally casting front 1/4" OD stud fits through a corresponding hole just below the middle of the "handle"; the casting should have a cutaway in the top of the front edge so it can tuck under the "handle" and over the heads of the bolts through the "handle" and the fender. According to http://stainlessbits.com/link12.html
, those bolts were roundhead, but my T150 has the same casting and normal hex.-head bolts.
. Directly below/behind the hole for the stud is another (~5/16" ID?) hole, that's normally covered by the rear lamp ally casting; this is another hole that should have a grommet as the rear lamp wires pass through it to the underside of the fender.
. Nearing the rear/bottom of the fender, you might find two or four holes for 1/4" OD bolts:-
.. two of the holes should line up with the holes in the lower edge of the "Tail lamp plate";
.. these two holes would also line up with holes in the "Number plate bracket" shown in the parts book (although note the bracket is drawn upside-down ...
Problem with just the one bracket mounting the "Number plate"/licence plate by just the plate's top edge is these old parallel twins were apt to vibrate a bit,
the plate vibrated and some eventually cracked just below the bracket. So, later, Triumph added another "Number plate bracket" - 83-4784.
Original fenders have two vertically-slotted 1/4"-wide holes to mount the lower "Number plate bracket" where it'd bolt to the bottom edge of a US licence plate (your repro fender might have just ~1/4" ID holes?). If you don't have both brackets, but fancy adding the second one, first look at on-line images of both to determine which one you have - the trade is completely confused about which part number applies to which bracket - Googling first "triumph 82-6850" and then "triumph 83-4784" return images of both brackets under both part numbers.
Finally, not shown for '68 but fitted and shown in the parts books '69-'73 is F7826 "Wiring protector". It attaches to the rear lamp ally casting stud and one of the fender mounting bolts behind/in front of the rear frame loop; protects the rear lamp wiring under the fender.