^None of it is different. Just some fittings are missing. Bolt on B-pillar, doors, thar windshield. Get these four parts and the oem mahindra hardtop will drop in straight.
It would be nice but that's very unlikely. The best bet is for a parts supplier like ontherox to buy a crate of the necessary parts and have it shipped to the US. Then they can sell the kits to individuals.
As I look over this I'm sure the kit will need to include doors, windshield, rear tail gate and a pillar. This kit would likely cost at least $3500 with the cab over system included. Then the buyer will need to paint everything.
In the end I think the best bet is for someone like best top or ramage to come out with a nice looking system simular to the CJ7 cab over kit. Something like that will probably go for around a grand.