My brother and I used to run the Bosch Platinums every chance we got. They never failed. The difficulty was that you had to buy them 4 at a time which cost too much for a plug that never wore out. If the length is right and the threads are the same give it a try.

 

Ok, this is what I came up with
My cross comes up with an NGK BKR5ES-11 which is 3 heat ranges hotter then stock, so with the mods you have at this point, you don't need a plug that hot. Don't take the chance of detonation (pre ingition) and damage the engine.
The Bosch also crosses to an ND K16PR-U11.
Your options as I found are NGK B8EV, B8EGV, or ND W24ES-ZU as premium plugs.
I never thought to look to see what it fit DUH.
I'm sure theres a Bosch to fit your machine, and again, they are top notch plugs. My local part supplier will sell singles, and I think you can also order single plugs from a Parts-Unlimited dealer. I'm a P-U dealer, so I'll check my books in the morning. One of these days, I'll install the software on the home system to access P-Us system when I'm at home and playing.
Talk at you soon.
Pete

 

Thanks for all the info. Ill stick with the NGK's, I just wanted to know what the heck these were, now I am at peace.. They look neat but a spark plug is a spark plug and I harldy ever foul them I preferr ngk but these things sure look neat! lol! Anyways thanks for the help everybody.