a bunch of steel, grinder and a welder...and Anything will fit! oh yeah, and a good measuring tape...lol
Blaner fit yfz450 a arms on a blaster...anything is possible.
rather get hold of some ASR blaster arms or civicdudes custom blaster arms, if you keen to fab, check out my 450 suspension upgrade stickied in the suspension section
The suspensions are SIMILAR but not interchangeable.
You could put banshee a-arms onto a blaster but it would require major modifications to the frame (like Blaner's setup for a complete YFZ450 suspension) and as Larry's Shee said, the banshee front suspension isn't anything to write home about either...