Ah.  I see what you mean about the head tilt.   You can usually find Kneadatite in hardware stores and there are several places to buy it online if it’s not carried locally. It’s green stuff but sold in larger quantities/lower price per inch. I ordered online last time, but picked it up in Lowe’s or Home Depot before. It’s used to seal pipes.

Creme heads are too big. Grey are fine. But why you don't like kasrkins heads? There is heads with gasmasks which looks good. Also if you cut off filters you get almost same heads as your grey but fitting perfectly

The creme to me looked a bit big, the grey looks a better fit. The head with night vision goggles looks cool.