History Mcgurk Lifter Sleeves

I picked up this set of Mcgurk hydraulic lifter conversion sleeves. This set is for 49-56 Olds Rocket lifters. It's missing a couple sleeves for some reason but I thought I'd post pics and some measurements here for future collective reference. The sleeves are 1.300" long, 0.560"OD, 0.425"ID


If anyone has a set for the 371/394 Oldsmobile engines with the .921 lifters I'd be interested in seeing pics and knowing how long the sleeves are.