wraith

It's fu£ked I'm afraid. You can get replacements but depends on which end you will need to buy ever the leave or the gear change bit (don't know the name of it). But the cheapest and easiest way is to cut the bar with the ball on the end off, (the bit that fits inside) drill a hole. Buy a new as @Gixer1460says a rod end and use a nylon nut and bolt to refit it.

And how do you know when it's the right length

Gsxr

I put progressive fork spring in, it will help a lot I put a set in my gsx1100 et (that's got a b12 front end and engine) and it completely changed the bike. But I'm 15st and need to change the oil to a lighter one as they are a bit hard for my wight, so might be worth spending the money

Check the nylon washer for wear, as if they are the needles won't sit straight

Nice As to Q1 a lot of people have done the cable conversion to the 1100/1200 so won't be a problem the other way round, think the only fiddly bit is the clutch push rod length as the 600/750 oil cooled engines have a longer push rod if I remember right, but it's just a M6 round bar so easy to make different sizes. Can't help with Q2

You can use some gsx750f carb rubbers/manifolds, still use the 36mm carbs but the intake rubbers are shorter than b12 ones. Thought you have to use the air box rubbers with the foam filter?

Yes I do think the springs make a big difference

I put 15 in my forks with progressive springs that's fitted to the gsx1157et and I'm finding them a bit hard, so over the winter going to put 10 in instead

It's a old tech sheet

Not the best to read Seems to be gsxr1100/750 oil cooled or w/c at 312mm ZX10 85-89 314mm FZR1000 87-88 300mm But I don't know if the non Suzuki are eye at the top and fork at the bottom. Some CBR's seem to be around the same length, but the are eye top and bottom

Might help

No. It was only the gsxr750 slabside that had these carbs and they where 29mm But as said you can bore them out to 33mm

I'm sure someone may know, as swingarm swaps have been done quite a lot. Maybe post something in the general section as it's a cross over between air and oil

Yes but you will also need the oil pick for it to fit and suck the oil up. Think you will also need to sort the oil cooler lines