I'm planning to put my stage 4 heads on soon, and since I bought some yella terra 1.8's with stok replacement PR's I really don't want to buy another set, much less have te downtime of ordering another set. Are the spacers that ZZP sells any good? If it properly and reliably fixes the issue with the longer valves, I have no issue with buying them, plus they're cheaper than buying new PR's.