I have a couple of questions for all of you Volvo guru's out there, I'm talking about a Volvo 280 on my 1976 18' Classic. First question, are the 6 attachment bolts supposed to have o-rings on them between the transom shield and the back on the boat? Second, what are those carriage bolts supposed to be torqued to? Third, what are the 6 inner bolts that hold the output shaft and big donuts in place supposed to be torqued to? I'm a bit confused on the o-ring thing as from what I'm now reading that the back of the boat should have an indentation for them so seat into and just wanted to see what your thoughts were. Thanks for any insight.