I think (and I could be wrong here) that Safari are a bit lazy!
I believe that once upon a time the diesel XJ boys didn't have a Safari snorkel. So one of them worked out which existing snorkel was the closest fit, worked out how to convert it to the diesel XJ, told Safari about it, and hey-presto a diesel XJ Safari snorkel becomes available!
Probably they're waiting for someone in the KJ gang to do the same thing. There's a 5 page thread (and other miscellaneous threads) on the LOST board in the US about this. It seems that the old Toyota Tacoma (I don't even know what that is!) snorkel is the closest fit. It just takes someone with the balls enough to cut a big hole in the side of their Jeep to try it!
See;
http://www.lostkjs.com/forum/phpBB2/...pic.php?t=3023