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Does anyone remember which stores sold autocannon arm bits for dreadnoughts? Specifically the ones that were mounted on armatures with horizontally mounted cannons?

Forgeworld autocannons are commonly used to create the arms. There are also 3rd party creators of the same things, but I don't know where they could be found, since I don't run metagame lists.

Puppetswar sells some great dreadnought arms, although it depends on what exactly you mean by 'armatures' as to whether or not you'd like them.

Honestly, using plastic lascannon arms would probably be much cheaper and it wouldn't take too much effort to convert them to look like autocannons. It isn't like they have to have the giant protruding drum magazines to be autocannons.

I used spare Assault cannon arms for the right arm mountings.

The cannons came off and went into the bits box or crucible.

Then two sizes of tubing were used to make the cannon barrels (you can get the stuff in packs where each diameter tube will fit inside another one). These were glued to the arms.

For the LEFT arms, spare missile pod arms were used.
Missile launcher front panel removed.
Autocannons were made as for the other arm and attached.

Lascannon arms are the other option.

It was those puppetswar arms that I needed, thanks!

Another way to do it is get the lascannon arms and cut the lascannons of and switch it with IG autocannons.