I was wondering if anyone was aware of a chart/mapping of the Air Arms S5xx/S4xx o-ring part numbers to o-rings on the market. Over the years I’ve purchased a couple of the rebuild kits but it seems there are a few o-rings that fail more frequently, such as around the pressure gauge and fill port/valve. I’d prefer to just buy a bag of these and replace them as opposed to either buying the rebuild kit or the OEM pricing. Thanks!