You wont find a synthetic stock to fit it, or any stock at all really unless you order a custom one from someone like Stockade Gunstocks(composite), Richards Stocks(laminate and really rough upon arrival) or Sharpshooter Supply(laminate).
The phrase "J action" is really just slang we use to identify it. In those years they may have changed one small thing or mix matched a part on the model and just called it a "series"(like yours is a series H) The true name for it is an "intermediate short action", but if you say "J action" around here we will all know what ya mean. Most of us call it that anyway....LOL
Welcome to the site by the way!
I havent done it or know anyone who has, but a centerfeed short action is close to that measurement at 4.400, so it may be possible to remove the front pillar, redrill the hole at a 4.522 spacing, and rebed the pillar and the action. I wouldnt know without having the action and stock in front of me to know if it is even possible. Just an idea though.
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