Where can I get lengths of "suppressed marked" HT leads for my Indy-Blade, all I can find is ready made sets.

I have the same problem and as yet have not found anywhere. Magnecor won't sell it by the length, i asked.
I have had to buy an extra set of originla coils and mount them nearer the carbs.
If you do find anywhere i would really like to know though!
Sorry i cant be any more help. The only thing you could do is go to Halfrauds and look through the individual leads they sell, and buy 4 the length you need.