In the early Eighties Redline made 2 sizes of V-Bar - Redline V-Bars were 23" wide, Proline V-Bars were 26" wide.
The STR Series came out in 1983 coinciding with the launch of the REdline PL-20 Carerra II. They were similar to the Proline V-Bars but with slightly straighter lines and more angular curves . FRom memory they were also approximately 28" wide.
Non of the above should be confused with Win V-Bars used on some Kuwaharas usually having a "Kuzuki Japan" Decal or "Redline Approved" Decal.
Hope this helps dude
John