Hi Muecke, you may have found one by now but as Geraldo suggests, you can buy one that will fit from Mikuni. There not exactly the same because many motorcycle manufacturers make their parts slightly different sizes so you cannot go straight to a third party and buy the replacement part. About 5 minutes with a round file elongating the mounting holes fixes that however.
If I have done it right, you should be able to read the table below The bolt hole for the klx rubber flange is 6 mm and from the centre of one hole to the next is 67mm. I use a 36mm carb so run an I-VM34-200-1
The critical dimension is the carb spigot (outside diameter) of the carb that goes intothe rubber flange
Hi Grouty, I have been off line for a while - trying to find something to nake a vintage road race bike out of. Good to hear your 262 is going well, I will send you some photos of mine next week
Cheers, Derail
RUBBER MOUNTING FLANGES
Part Number 8.5 MMBolt Carb Bore Carb Spigot Flange Throat Typical Carb Size
Hole Size Diameter Depth
I-VM28-200-1 60 30 35 28 26-28
VM30/288 57 30 37 23 26-28
VM32/205 75 34 40 32 30-34
I-VM34-200-1 60 36 40 25 30-34
I-VM36-200-1 70 40 43 25 36-40
I-VM38-200-1 75 40 43 28 36-40
I-VM40-200-1 75 46 52 32 40-44
I-VM44-200-1 84 46 52 26 40-44
KHS-004 70-75 40 43 28 36-40
HS42/018-42 70-75 42 45 25 42
HS42/018-45 70-75 45 48 25 45
HS42/018-48 70-78 48 51 25 48