Why use such a little-known maker for cutoff tools? There's plenty of the well-know maker's stuff out there that would be so much easier to find from myriad sources.
These days, cutoff tools are all propreitary inserts, blades and/or holders. About the only thin left that is interchangeable is the blade holder blocks. A 26mm or 32mm blade from one company fits into another company's block. With the inserts and blades, there's not much interchangeable. I do believe you've probably got a 32mm (1.250" - 1.260") tall blade with a 25mm (.984") height from bottom of blade to cutting edge.
Some Kennametal will exchange with some Manchester as Kennametal owns both companies. Same for for Sandvik and Valenite (now Walter Valenite.) The Sandvik Coromant R/L/N 151.2 series interchanges with Valenite VSG series. The Coromant R/L/N 123 series swaps with Valenite VTG series stuff. Same pocket geometry in the blades and insert shapes, just different grades, coatings and chipbreakers for the inserts.
If "Swarf" changes with any other company, I've never heard of it.
Walter has some cutoff tools with a "XLDE" designation but the double-ended inserts for them are a GX16 or GX24 style. Like I said, it's all proprietary so get into a system with one of the more well-known brands to be sure you can get the stuff for a long time to come. There's no ISO or ANSI standard in grooving/cutoff since the v-bottomed/flat-topped "dogbones" of the 1960's into the 1980's, (Valenite VDB, for example) and they're not well-supported now because the geometry sucked.
The "8030" grade you mention sounds like it could come from Ingersoll/Taegutec, so check into their system. Maybe they have blades for your inserts. I'd find one blade, exhaust the insert supply and get into a better-known brand.
Geezuz...I just went "googling" that Swarf cutoff tool and there is NOTHING out there! Where the heck did you buy such a thing?