If pt313.2 fit with tk238 16x19 than i can make sure the microgel grommet can not fit.
In my opinion, tgt tgk231.3, pt310, pt313.2, pt57 16x19 are 95", all of them are same spacing and string pattern 16x19, same fit with grommet tk238 16x19.
I tried with microgel grommet for tgk231. But it's not...