Hello! I'm one of the mods of the prospective 90s movie exchange -- this is not an official mod decision but I think we'd be fine with most OVAs. We'd probably have to know the specifics before we could make a final decision, but anything that is a canon that stands alone (unrelated to an animated series) and more or less movie length (let's say 3-4 hours or shorter), would probably be fine, especially if it was ever released on dvd/vhs in the form of a single long story. Anything longer than that, or an OVA that is closely related to an ongoing tv series canon, we'd probably have to ask for more details before approving it.