Bi-Pod question

[Klaus]

I was wondering when the plastic footed bi-pods for the 90 series rifles came out and did HK even make them?

 

[Tailflash]

One came with my HK93 that I purchased back in 1986; IC Date Code. They're alright, but I ended up breaking off one of the feet and years later purchased someone else's plastic foot bipod that had the opposite foot broken off. I can't figure why someone hasn't come along and made replacement plastic feet or upgraded metal feet for these.