As I understand it, the 5A was the exact same parts. Since Winchester sold everything to Lyman. Try this fellow below, also, if you can find a part number or a lens specification, I’ve had good luck with finding them at the web address below. By using part numbers I found a large supply of OEM M81/82 and 84 glass and parts “very” cheap. I was able to repair a number of scopes, even the old Winchester #8s (8X).
I’ll pm you instead, check your in box. I couldn’t remember his eBay seller ID.