I've a complete spare parts catalogue for the Lightning, so part numbers, etc aren't a problem.
Although the Lightning is a dressed up Bullet. There's one difference. That's the gearbox casing. The Lightning has a hole for the neutral switch, where the Bullet item doesn't. I actually find this surprising. I would've thought (in this day and age) that having a neutral light on a bike (especially with the clunky Enfield box) would be a requirement.
Considering that the Lightning had such a short production life span. Some parts are going to be made of 'unobtainium'. That said. Other parts that would've been fitted to Bullet's seem to be equally hard to get hold of. The chrome air box on my bike is rather manky. Can I get a replacement that's the same? Nope. I've had to buy a chrome air box from an older Bullet (Possible Superstar model) which was easily available.
The only other major change I've made is the barrel. I thought the black iron barrel looked a bit out of place, so I changed it for an alloy one. In my opinion. The Lightning's engine looks right now.
One thing I did do when I bought the bike, is that I fitted a Motrax speedo converter. When the bike was delivered. It had 127KMS on the clock. The speedo now reads in MPH and Miles. Here's a picture of the Lightning, as delivered.