Hi, I don't know what that is exactly called, but found on ebay as Single 180 Degree Split Image Focusing focus Screen For Pentax K10D DSLR
This is the frosted glass closing and opening view finder. I have successfully broke this [ slipped inside and had to force remove lens and broke]

I did notice after cleaning that the clip is failing the hold the frosted glass, but managed till now.

Can I ask whether the clip can be repaired or RIP this camera [K10D]
please advice