The drilled holes work sometimes but often not. I would not try the stress relieved drilled hole on these dashes. We've used it on various materials including wood, hot tubs , and I tried it on my E30 dash only to see the crack continue thru the hole. Conditioning and heat control would likely be better... If you have the windshield out anytime , remove and don't replace the screw under the seal. I think it puts unnecessary restraint on the dash causing cracks right in that area.