The reflectors on the tail and forks of my FXST have to go, are they just stuck on or do I need to buy parts to replace them with something else ?

Yeah get rid of them.The only time someone will see them is when it's too late.

Just heat them up with a hair drier and peel them off. The doublesided tape with ball up if you rub it with your finger or thumb and with pull off easily. or you could use nailpolish remover and some paper towel. Then clean it with hot water and mild soap.

Takes all of 15 minutes. Took mine off the day I took it home cause NO BASTARD sees them anyway.

Dealer told me to use dental floss of all thinggs.
Worked a treat & cleaned up with metho

I took them off my fatboy with fishing line (use it in a sawing motion behind the reflector) then to get the remaining tape off just use a cheap fly spray - thats right fly spray it takes the shit straight off.