fuel tank for 69 mercury

Any std  slimline tank should fit a Mercury.  The petrol cap on the left side just  usually signifies that the tank was made  before 1963 ,  The only std slimline tank that wont work is that of a Manxman  which is much smaller  with visible seams and needs a different seat length. And worth a fortune !!. Not likely that you will find one spare.Wideline tanks dont fit and have the strap fixing down the middle. A custom  tank from a triton  slimline should fit but may be non std  length  and need a shorter /longer seat . Some tritons are wideline ,so no good.

Denis,

My 1969 Mercury has the filler cap on the right hand side and would agree with Robert's info.  I've wondered why the filler cap was moved from left to right on later machines; perhaps selling to the USA meant that with driving on the right the filler was nearest to the petrol pumps?

Either tank with left or right hand filler will be fine, unless you're entering concours shows!

will fit. I know, my first-ever Norton, a 1961 S/L 88 had no tank when I found it in 1970. The first tank I could get was a W/L; of course it doesn't have the 2 front fixing bolts underneath, but with a go-faster ally strap and rubber mounts it served until I got round to finding a S/L tank.

For obvious reasons a S/L tank does not make a good fit on a W/L.

Having the tank cap on the right side makes it easier to get it full if you have it on the side stand.

Triton was never a manufacturer - it just implies that someone has put a Triumph engine in a Norton chassis. Similarly, Triumph never used Norton tanks.

Anyway, any slimline Norton tank will fit your frame.

Looks like it has the recess at the front for the tank strap used on wideline frames

Looks like it may fit ,   I think Dresda Triton may have been  recognised as a manufacturer , certainly made lots of Tritons.

The small tank was also used on the Atlas and ES2, possibly as an option, in the North American Market, maybe other models as well, the ES2 looks particularly strange with it on. I have one and the bottom pressing looks to be the same as the standard one, I will have a look if it really is shorter or not.

The seam could easily have been filled and concealed, I don't  know why they left it like it is, because it looks a bit of a dogs breakfast.

Denis,

My 1969 Mercury has the same three matching numbers as well.

Regards, Philip

As built,  all Mercuries had three matching numbers.  Similarly 750 Commandos and 750 Norton Hybrids all matched.   I'm unsure about the AJS/Matchless Hybrids.  Cheers, howard