Funny thing is, the parts book doesn't list the bolts. It's very good about doing that for just about everything else but not the arm rests. The bolts must be part of the kit as they are listed in HJ Parts book under accessories. Incidentally, there are four styles listed: Century brown and Temple gray for the four cylinder cars, Burma brown dragon vinyl and Cape Verde green dragon vinyl for the six cylinder cars. No additional ones types listed in the '52-'53 supplement so assume they used the same. Looks like we've got deluxe models covered with the pictures posted but not the others. It makes no distinction between right and left, further evidence that those in that ebay ad are not factory issue. Mine all have slotted (flat blade) screw heads but some of the Kaiser bolts I have are philips head. As we pointed out, the Kaiser ones are a bit longer so use caution and verify what you have does not rub the glass when rolling the window up and down. Grinding is the answer if they do and you don't need to grind off much.