Gearbox :(

I have a 5 speed gear box and the gears don't seem to go in gear very easy and also just seems to be loose, not nice and tight. Maybe its coz it is an old car but just wondering these kits on ebay;

http://www.ebay.co.uk/itm/Full-Gear-Shift-Repair-Kit-With-Rods-5-SPEED-GEARBOX-171798200-171798200A-NEW-/170726243525?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Car+Make%3AVW|Model%3AGolf|Plat_Gen%3AMK+I&hash=item27c013bcc5

Please advise.

Cheers

Iain