Pretty hard without knowing what you had/have.
Now at least its possible to make a guess that the 'metal insert' might have referred to the spring clip used on some universal refills to adapt them to the push-locks. (shown on the right side of
this photo). Can't see enough in your photo. It does look like the refill is sticking out an 1" from the blade.
Like I posted above some people appreciate the original stuff so you'll find a buyer if you don't want to keep it. Can't help you on the "classic", never used them.
A Trico 43 series is a universal replacement that although little narrow and a fraction long, is the type I've used in the past. There might be a wider version but I stopped looking after picking up a set of correct old stock.
Something like these should be the correct fit.
http://www.ebay.com/itm/331639757032?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649But old stock is what it is. Its not for everyone or all situations. Just letting you know its there if you want it.
