Spaced out: divided or open

I'll add to the confusion....On my current 410 stroker I run a 1" 4 hole tappered spacer on top of a 1/2" wood open spacer

See I would love to have a tapered, just not willing to spend the 100 or so for it and would prefer a phenolic one lol the biggest factor really is space though and I really just have a little over 1/2" to work with. At this point it really just is open vs divided. I think without an open below it, a four hole just isn't conducive.