The variety of the filter depends on what is installed. The're are numerous versions.
The're are Kenwood filters and INRAD filters, IMHO the later being better quality.
I had like 6 different filters installed in my TS-450.
6 kc AM filter
Cascade 2.4 kc SSB (extra 2.4/ one for each IF)(this board/filter is no longer available)
2.8 kc SSB
1.8 kc SSB
The INRAD filters I had installed, were actually in total worth more than the radio itself, when I sold it.
The Kenwood filters average about $75-100 each on used market.
The INRAD filters when you find them used are around $100 each
(some cost $150-$200 new)
International Radio ::... (inrad.net)
As you see from the list EACH RX/IF has a group of filters which can be installed.
My rig had a great receiver in it with the additional filters installed.
The adjacent channel rejection was excellent.
I sold that rig when I purchased my new Yaesu rig, maybe 10 years ago.
All the Best
Gary
PS: Many of the TS-450S rigs had tuner installed, though in the very early versions it was an option.
KENWOOD TS-450S HF TRANSCEIVER LEAKING CAPACITOR REPAIR | Flickr