Headshell weight - Sumiko HS-12 vs Technics

How much more does the Sumiko HS-12 weigh over the stock Technics SL-3200 headshell?
Will I need to add an auxiliary counterweight to my tone arm if I use the Sumiko HS-12 with a cartridge that weighs 5 grams? If so, where can I buy an auxiliary weight for my turntable?
Thanks!
Mika