Hi, I agree with Mahiruha. Its not anything high tech. I am also game for stock if we can all put our requirements together, it will be a sizable order for someone. else, am sure, if we scout the market a little, and decrease the size parameters to just the width, then even if we get bigger length sizes, we cud just mass cut the length of the covers. You will be surprised by the kind of sizes the guys in the market have. I will start looking around and inform if I get anything. You also pls let me know.
Also think about laminated brown paper or other paper covers if you think thats better.So in case the original lp cover is in tatters, you can take it apart in two pieces and stick them on this laminated paper sleeve, this will ensure your original cover stays, and the jacket becomes stronger with stronger joints.
Why brown paper, well, because its strong at that price point. You can get lots of other paper too, tons of imported paper but they won't be so cost effective.
since new records are not manufactured in India so there is no active demand for new sleeves in India. So getting new sleeves in the market is out of question. But if you have a close look at a sleeve it is a very basic technology. Hence my suggestion is just take a sample sleeve to a polythene manufacturer or somebody who produces polythene packages and get it custom made. I don't think it is too difficult a thing to do.