Originally Posted by stonedogcat
Your boat came with sandbags? From the factory or from a prior owner?
[Irony flag on]
Standard, of course. They're identical to run-of-the-mill sandbags, except they have the manufacturer's logo stamped on them, and cost 6 to 8 times as much. Replacing them with standard, off-the-shelf sandbags, however voids the warranty (manufacturer claims wrong kind of sand.)
[Irony flag off]
I would guess from the previous owner.
Forgot to say: Welcome to the forum, Stonedogcat.
Roger: Were you thinking about the single-tube arch or one of the built up custom whiz-bang arches?
On your A-19, I would think the single wouldn't be a problem at all (aside from fitment.) If you do it as DIY, make sure you seal up any holes in the transom (my dive buddy's A-19, bought second-hand from Hawaii, ran for about 2 weeks before it went into a shop to have the transom hollowed out and filled with resin.)