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Most off the shelf stuff is the same size (~1"X4"x3").
Only way I can think of to go smaller is to pull the shielded RF modulator module out of a VCR or sat box, google the data sheet and rig it to accept A/V and power inputs....I don't know your skill level, but this can vary from easy (I've got one out of an 80's cable box or VCR that has 4 input pins A,V,B+,Gnd), to complex (I have a REALLY tiny UHF agile multi-standard modulator out of a sat box that needs I^2C protocol from a micro-controller to set the channel, broadcast standard etc.*).
*That one I had to write code for an Arduino Uno board to control.
Personally (unless a set is rather beat up/undesirable, and the owner is motivated) I'm not a fan of modifying/hacking things up. If the mod becomes undesirable and is not easy to completely reverse, then the set takes on a crappy feel in any application after the mod falls out of use.
One thing that might be worth your consideration is not to modify the TV but find space elsewhere for a modulator and the chromecast. If the set is being used where you can't locate the modulator close and don't want to run cable, a good solution is to get a Blonder Tongue AM60, BAVMz or AM40 series modulator...While bigger than consumer offerings they (when working properly*) will provide superior picture and sound performance, and have enough RF power that with a good TX and RX antenna you can transmit wirelessly for a good block radius.
If you just want the chromecast/HDMI converter hidden for a classic look, perhaps you could hide those inside an old VCR (the VCR will have an RF modulator built in).
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