I have installed a l18 with 45mm sidedraft webers into my 1200 coupe. does anyone know what throttle cable to use ?. I have had a standard coupe cable lengthened but it doesn't look like to will work. any help would be greatly appreaciated.

What ever you need go into your local flexible drive agencies and they can make/modify any cable you need. I've had an SR20 accelerator cable modified to suit a stanza, and I'm about to get R31 handbrake cables modified to suit the same.

https://www.flexibledrive.com.au/

If in northern burbs of melbourne I've had them done by speedscreen in camp belfield.
But recently I've just used a broken accelerator cable sheath and swaged a bike brake cable end onto it. Work's a treat

is there a certain type of cable that fits or do u just modify a standard one to length? im very much still in the dark. Any help will be appreciated.

Call Joe at auto cables, he helped me out with the accelerator cable for my L20b in my 1200 coupe. i gave him samples of what i wanted on both ends and a piece of wire that was the length i wanted, he made it up and its still doing the job.

Autocables
www.autocables.com.au/
8 Golf Links Drive, Yarrambat VIC 3091
(03) 9436 1260