The Bolens STG 150 was built for the Gardenway company by what appears to be by Noma. Their model for it was 13082 and it was built in 1995. With Gardenway now being out of business; actually sold off to Troybilt and then to MTD and Noma also being gone the info is probably lost by now. The Bolens STG 150 also appears to had a Tecumseh 15 hp engine. (OHV15-204012)

Here what info I did find.

1996 Gardenway Service Seminar Book