Mahle file-fit piston rings for a single cylinder are listed for a 3.796" bore plus .005" and include ring sizes of 1.0mm, 1.0mm, and 2.0mm for top, second, and oil rings respectively. Sold as a single-cylinder set, these rings are intended for custom fitting to a single piston during engine assembly or repair where precise ring end gaps are hand-filed to match the bore.
Mahle MS 3.796in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings for Single Piston