Get a ITC cheekrest from DSA. They're great, & I use them on all my FALs that I have optics on standard stock or Para. They come with 3 different thickness pads that fit in the comb pocket. You can customize the amount of rise you need by changing them out. There are three velcro straps to hold it on. I trim off the extra length then stuff the remainder in under the pad thru the attachment slots with a butter knife.
BTW, Nice FAL!