FIRST Spurs SI 1-1/8" IS41 Headset

INCLUDES
2 x Sealed Bearings (Paired)
1 x Star Nut
1 x Top Cap
1 X Compression Cap
1 x 0.25mm Shim
1 x Crown Race Lower
1 x Bearing Race Upper

BEARING SPECIFICATIONS
Upper
30.2 x 41 x 6.5mm | 36° Inside x 45° Outside | 28.6mm Crown
30.2x41x6.5 36x45

Lower
30.2 x 41 x 6.5mm | 36° Inside x 45° Outside | 30mm Crown
30.2x41x6.5 36x45

Headset Compatibility
FSA Orbit IS-2 / IS41

Not sure on if this suits? Here are some part codes of bearings from other manufacturers which match these bearing specifications...

Upper & Lower
MR054, MR122, TH-873 / TH873S / TH873E, 27287-1046-004, HSS0130K & ACB3041 R2