can anyone give me some advice on the best method of installing front and rear glass,i have heard of the 3m tape system, also the tube type ,i think is urathane, but either way ,i remember that when i took out glass 6 years ago, there was these little hard rubber blocks , now i saw a 3m tape kit in the store ,and it only had the 2 or 3 little blocks to keep winshield in place,like from sliding down, nothing else ,i think tere were also ruber blocks of a different size that went up the sides , and across the top , really can,t remember if glass laid on top of these blocks or not, and i don,t understand how i can use these little spacers and but up against them with the new material, and not have leaks,if someone could give me the low down on the winshield insallation , would definatley appreciate it , thanks alot,will.