I use a moly antisieze that holds 60% of moly solids, its black as death and it good for about 1500C too.
The rubber grease can be sourced from outside Pakistan easily. If you have relatives/freinds in USA ask them to buy a tube of NAPA silglyde - its about 8 dollars only and is a LOT of lube.
I personally use rubber grease for assembly only and use silicone grease for servicing the guidepins. etc. silicone grease is literally waterproof.