I have a genuine LP53 barrel weight - if you fancy one let me know.
I also have a complete front end for an LP53 that is ready to plug into the rear half of another LP53 but I am guessing that won't be much use to you.
Sorry I gave away a new set of LP53 springs to a previous club member last year so they are gone.
Unfortunately I do not have any complete rear sight assemblies so hopefully somebody here on the BBS will turn up with one for you - or you could use the HW one you have been offered as I know of others that have fitted them and claim this fix does work OK.
Rossendale Target Shooting Club. Every Tuesday and Thursday evening 7 - 10pm.