Spark plug leads are more about marketing than anything else I feel.

They could shorten it. Or you could do it yourself. crap, it is not rocket science!
You just slip the rubber end up the lead and pry off the metal end, a bit of work with the pliers to open up the metal end so that you can fit the lead back in.
You cut the lead to the length that you want BUT VERY IMPORTANT.... The core of the lead must be left longer than the outer insulation, about 2cm longer.
You fold the thin core over and push the lead back in to the metal end and crimp it with pliers. Push the insulator back down over the metal end.

I've done this. It works. I made these using an old Champion set, because I too wanted right angles at both ends. These are showing a good spark on all four cylinders using a Nissan dizzy and GT40r coil. A squirt of wd40 down the rubber boot made it really easy to slide off the original boots on both the original straight plugs and the cannibilised right angle plugs.

Hmmm, I also used WD40 to get the boots to slide on the leads.

Spooky!