Nothing personal but I don't use Neal's seal either.........The inspection cap ones tend to either split or melt........Obviously they split from being over-tightened which is a problem from folk getting carried away. The ones over the valve caps melt from the engine heat........they are difficult to get to, so i don't use them.....Or If I do only on the shallow ones on the kick start cover and primary cover caps. The alloy washers that sit bellow the oil return lines are too hard and may or may not seal.......I use the original ones, but use small 1/4" ID dowty seals under the 1/4" BFS bolts, this seals really well without over tightening the bolts, this will start to crush the top of the banjo fitting..........The ones Glen is talking about do work ok, but again they melt and weld themselves into the head, making removal difficult........ I find the original seals available from the VOC the best. Again I only use "O" rings on all the lower pushrod tubes now, easy to do and nil leaks. If the extra smaller one is used immediately above the main sealing one, then they look fine without leaving a large gap.