Do you think your trans is original to this car? Info on that trans seems cryptic everywhere I look...but most consistently I'm seeing the ST300 only in 6 cylinder Firebirds. Do you by chance have PHS documentation for your car? I could be wrong on some of this, but the ST300 does seem to sometimes back V-8s in some Buicks, Olds, and other Pontiac lines like Tempest/Lemans. It was only produced for a few years. A bit of an odd duck trans. And I think MANY people make the same mistake that book did, and mistake their ST300 for a Powerglide, just cuz they both have 2 gears and were produced during the same timeframe...
Others here likely know more than I do on this topic.
I wonder if these would work...same lines...one stainless and one regular steel:
They specify ST300 Trans with a V8...GTO and Lemans. But not Firebird. Might work though with some tweaks. Maybe worthy of calling the manufacturer to discuss.
Otherwise, if you take your old lines to an auto part store, they can probably match the fittings and lengths up, and you may be able to make/bend your own to fit. Or re-use your fittings if they can't match them, and just put them on new lines.
