You should be able to get it locally and a ton more for a lot less cash. I got several tubs of the stuff which will last me until the year 2080 or thereabouts 
Try searching for “Front Post Mount to IS 203” locally online or ask in a LBS.
It needs to be front and look something like this one:
I never enjoy finding the right one. It should be easy but at times it feels like you’re going to buy the wrong thing as there’s so many different types.
It can feel a bit too wide for some. But with practice I find this can be learned to feel normal.
Here’s hoping shipping isn’t delayed with these pre-June priced hubs 
-Felix / mindbalance