JJC makes a plastic knock off of the old rectangular plastic PH-SA49 Pentax hood called the LH-SA49 which is supposed to fit the following lenses:
DA 35 f/2.4
A/F/FA 50 f/1.4
A/F/FA 50 f/1.7
A 50 f/2
However it isn't clear if the 35mm recommendation would hold true on FF. I know the hood was used on 50mm f/1.4 and f/1.7 lenses originally on film. They are available on Amazon, Ebay, etc. The hood is a bit of a pain since based on the shape it doesn't slip over an F 50 f/1.7 in reverse and even on a DA 35 reversed it is hard to find a lens cap that fits the reversed hood reliably. I personally have used Nikon HS-x series hoods with 52mm rings on a number of Pentax lenses with no issues. The 49mm F/FA series caps and 52mm caps from many vendors fit the hood reversed "ok".
The older 49mm Takumar hood for f/3.5 135 / 200 f/5.6 is a nice hood for APSC 100mm f/2.8 but rather long for that lens on FF. It "might" work on the 100mm f/4 - but I forget what is the filter size on that lens? The hood in question is 49mm.
I'll also chime in that a lot of great rubber lens hoods are out there - but there is a ton of cheap garbage also. Step rings and patience and raiding old lens sales may be the best choice.
---------- Post added 04-11-16 at 04:50 PM ----------
A lot of the lenses list their hoods in the database. For example:
SMC Pentax-M 100mm F4 Macro Reviews - M Prime Lenses - Pentax Lens Reviews & Lens Database
This lists the PH-R49 (which works with the 50mm lenses mentioned earlier) as fitting but not needed due to recessed front element.
---------- Post added 04-11-16 at 04:53 PM ----------
Another source of info:
K 28/3.5
Notice the PH-S52 is listed as optional not shipped with the lens. It also is listed as the hood for your 35 f/3.5 - looks like you need two hoods. The PH-S49 or PH-R49 (or RH-49) and then the same in 52mm... The 100 f/4 can do without or you can add the PH-R49.
Last edited by UncleVanya; 04-11-2016 at 01:56 PM.