No they don't need starter weights, just put them over! Downside is, no they wont fit on 2000 or 3000 or any tractor with those wheel centers, sadly that includes a Dexta

. Also it depends on what wheel centers was fitted to the tractor, like for instance, One of my uncles has got another 5000 but he can't put weights on them because before he bought it somebody took the rear wheel rims and cetners off a ....massey ferguson and fitted it to the 5000.
You're lucky for having the full set of weights (3 for each wheel) our tractor has oly one each wheel. My father tried to look for more weights for sale but he found out that they have gone..quite expensive(someone here was selling several pairs of weights but upon inquiring we found out that a single wheel weight costs 4000 pesos, so, 8000 pesos for a pair!!!)
those weights in our tractor may look exactly like the weights in your link, but the weights in our tractor did not have "FORD" stamped in it. In its place was an even larger logo, which says "GAMI" in it. according to my father, GAMI stands for "Gregorio Araneta Machineries Inc. which, according to him, was the main distributor of ford tractors here in the Philippines back then. I'm pretty sure they made the weights for our tractor, even though i have seen some tractors around here with original FORD weights lately. My father used to tell me about seeing the main dealership of GAMI back then when he was studying, saying it was full of ford tractors like 7000s and the rest. That might be a delightful sight for me...
Thank you for your concerns. Good thing is that the typhoon did not go through Luzon island (if you're looking at the map of the Philippines, it was the large massive island that makes up the northern part of Philippines and, that's where we live) taking the Visayas group of islands instead. But seeing the devastation in the television gives everyone a hint of how powerful it is and of how unrealistic was the damage it gives.
I feel sad for the victims, very, very sad.