Broken STI gearshift

I have a 21 speed Mountain Bike .. certainly not new.
It has Shimano combined brake & gear shift – I can find no model number on it, only the STI sticker.
Picture attached – front derailleur shift this has failed and I need to replace – is this style still available, in which case I only need to change the one side.

If not available, any particular shift I should consider ...... gear set is probably now thought of as ancient, was top sepc at the time ..... both Front & Rear derailleur are Shimano Exage 500 LX
So something that matches .. no point in over-specifying shift levers.




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