I have started using Wynns lead substitute. The reason I selected it was 1, it has a measure so you can put in the correct amount, I never like the 1/2 bottle per tank idea. And 2, it has a fuel stabiliser for keeping the fuel fresher. Probably...

It's 22L, not 021 or 02L. They never made an axle with those codes. Defender 90 front axle. https://www.lrworkshop.com/axles-differentials/axlecodes You old gits are your own worst enemies! Post big pictures, not postage stamps. Clean the mud...

I suppose that is true enough about us old gits

Someone might be close enough! I would put it in either diesel or petrol in small quantities!

If you have enough space you could use a stainless steel exhaust reducer that matches the sizes you want and then use fuel safe pipe for the rest. Could probably get an exhaust bend either made up or off the shelf if needed.

My fitbit thought I was riding a bike when I drove my 2.5na. The i watch use to warn me for loads of loud noise issues - turned that sh1t off.

Don't know about this car but on at least some it should be manual until you press pass the resistance at 100% throttle to the kickdown button which will override your gear selection