They are still making them. You are all over the map with your question.. Yes, they finally started putting cross bolts in the 375 stocks. That started in '56. They went to 2 cross bolts in '57 and then later changed it up in '59. I actually saw a used supergrade 375H&H at Cabela's the other day.. I don't even know if it was a classic or BACO. I'm not in the market for one, so just skimmed right on by it.. You are asking for an awful lot if you expect any of the 375's to weigh less than 9 pounds.
Pretty sure that Super Grade had a replacement pad,if it was the one on the outside of the gun room!
Its in the gun library. Like I said, I didn't look at it at all. Just in passing. I saw the tag said 375 H&H though. Maybe you can enlighten these guys to what it was exactly.. As for buying model 70's, you better be on your A game, because I'm going to be snagging all the ones that I see that are good deals in your area..