These are the Screw bolts for the black metal flywheel cover which the pull starter screws onto. 

PLEASE NOTE THESE ARE THE LOWER SPRING CAPS, NOT THE UPPER ONES.

For Tecumseh Prisma 37, 40, 50, E-34, E-37, E-47, E-57, Spectra 37, 40, Synergy 38, 40, 50, Vantage 35, 40, E-36 Engines,

For Tecumseh Prisma 37, Prisma 40, Prisma 50, Prisma E-34, Prisma E-37, Prisma E-47, Prisma E-57, Vantage 35, Vantage 40, Vantage E-36, Vantage E-46, Vantage E-56, Spectra 37, Spectra 40, Spectra E-38, Spectra E-48, Spectra E-58 Engines,

For Tecumseh, Aspera, Tecnamotor Engines:  BH35, BH37, BH37G, BH40, BH40G, BH45, BH45G, BV133, BV153, BV173, BVL153, BVL173, BVL198, BVS143, BVS153, BVS173, Centura E-61, Centura E-62, Centura G E-67, ECV100, ECV120, Futura E-71, GEOTEC 35, GNR E-63, H30, H35, HS40, HS50, HSK30, HSK40, HSSK50, HTL40, LAV40, LAV50, Legend, LH195SP, LV156, Prisma 37, Prisma 40, Prisma 50, Prisma E-34, Prisma E-37, Prisma E-47, Prisma E-57, SBH-48, SBH-92, SBH-161A, SBH-521, SBV-5767C, Spectra 37, Spectra 40, Synergy 38, Synergy 40, Synergy 50, Vantage 35, Vantage 40, Vantage E-36, Vantage E-46, Vantage E-56, TNT100, TNT120, TVS75, TVS90, TVS100, TVS105, TVS115, TVS120, TVXL90, TVXL105, TVXL115, VLXL55, VLV126,