Steve,
Once upon a time that Hasegawa Panther was a good kit, but those days are long past.
Along came ESCI with a decent Panther, but the Nay Sayers state that it is woefully inaccurate, Now the competition is between Revell and Dragon.
For PE screens Eduard produces quite a number of detail sets, they can be found at:
(
http://www.eduard.cz/products/list.php?type=1&pgroup=2 )
When you open the site,click the scale window to 1/72, then browse to the kit that will fill your needs.

As far as Hasegawa is concerned ....., if you absolutely must go with that kit, I do not believe there is a PE set for that kit, but, if you must have grill screens for it, I suggest going to a Model Rail Road shop. There are many manufacturers that produce theses for HO trains.

I hope this helps.
-Ken :-)