Need to replace my worn out original rubber motor mounts and would like to upgrade to poly. My K5 is a '90. Does anybody have the p/n for the Energy Suspension poly inserts? I can't find the exact number for my application on any site, or even the p/n for a 5.7L gas Blazer. The Energy Suspension site lists two different style inserts, but doesn't give specific model information. Also, is that the way to go for a budget upgrade? The ORD comp mounts look nice, but are pretty $$$$.