Van's told me they made a standard spinner kit work, but they didn't tell me exactly what they did. If Van's is giving you specific guidance, that supersedes what I'm about to say.
In order to use your kit spinner components, I think you need to drill a different set of holes in the S-602-1 spinner plate, and make either make a new S-602B doubler out of sheet or fit the 3 blade pattern onto the existing S-602B (this won't be perfect because the existing holes and cutouts, and requires clocking for minimum impact). The rivet pattern for attaching the spinner plate and doubler will need to be different, I'd recommend you ask Van's about what to do there.
See attached template for the 3 blade mounting pattern and blade cutout. Make sure if you print it to use it directly as a template that the print is scaled correctly (the file is 1:1).
I haven't done this myself, nor has (to my knowledge) anyone other than Van's, so as with all things aircraft, approach with caution. If it does or doesn't work out, I'd like to know about it so I can better help the next builder.
