Here is a couple of pictures of the B2600i engine block (must be what you have according to your Radiator Hose thread) so you can see what you're dealing with.......keep in mind that if you are replacing an original steel freeze plug that has rusted out and is leaking coolant, then you will need to completely remove that rusted freeze plug in order to install a aftermarket rubber style freeze plug and not have it leak also!
Personally, I would install a new steel or brass freeze plug instead of a rubber one.......and remove whatever is in the way to do it correctly.
Anyway, here are some pics of the engine block......
Passenger (right) side of block....
View attachment 10680
Driver (Left) side of block....
View attachment 10681