You would need to check with the pole manufacturer if they do a top three for the pole you have in mind. There are some universal kits available but I would always go with a manufacturers proper item. I would also look closely at the cost of replacement sections and top kits before buying because breakages do happen and some sections can be very expensive, extra top kits is something you are likely to want if you get more into pole fishing so you can have different elastics for different swims.
You haven't given a budget, but the Shimano 850 Beastmaster margin pole, at 8.5m, is about £170 new with 2 power top 2s. A new top two is about £50. Then the Shimano Catana 13metre is about £299 and the Maver Respect at 13m is also about £299. Both of these have top 3s and 2s available for the £50 to £60 mark.
Having had a waggle of the 850 in the shop, I thought it felt light and balanced and would make an excellent margin pole and be fishable all day at full length. The low cost 13m poles are not fishable for any length of time at full length, not with any degree of comfort or pleasure anyway, and will be droopy and floppy at full length but fished one or two sections short they will be very nice.
Just going back to the section cost for a minute, as an example say you were to buy a £1500 16m pole and then broke the number 5 section, you could easily pay £350+ for a new section whereas the lower end of the market the cost is more likely to be £70.
Remember if you are waggling a pole in the shop the elastication will add weight at the very extreme of the pole and will alter it's feel considerably at full length. I have owned two budget 13m poles and at less than full length they where great but at 13m they were'nt nice and would be useless for silvers, far to much droop and bounce.