I bought some elastomers for my FS-450 from the suspensionforkparts website
They work great although, while I bought them in 'Firm' they are still too soft for my weight (85kg) and I've had to add an extra small elastomer block from some spares I have just for a bit more resistance
Although in saying that, mine are the longer travel version with a coil-spring as well as the MCU's, so without a spring they might be firmer
I recommend for the next owner to just buy an elastomer for a seat post and cut it down and try that first
I got one off ebay ($6) and it feels very similar to the proper ones
The only thing is, apart from cutting it up (hacksaw) you need to bore out the center for the skewer to go through, not a big deal though
The bolt inside the legs should be an 8mm hex
I just attached an 8mm hex bit to a long socket-drive and with a little WD-40 had no trouble in undoing them
Giving the insides a good clean will really help
