I purchased these Erson Hydraulic roller lifters from Jim Weise for I think $550. Selling for almost $200 off at $375 plus shipping
That was the lifter I used before I located the Johnson's.. had good luck with them for several years.. then at some point had issues.. not sure when that set is from, could be fine, they were always a bit noisy, due to our Buick's commonly having about twice the lifter/bore clearance specified for those lifters. I used to buy them thru Erson.. part number is that of a 409 Chevy set.. same lifter and lifter bore center to center dimensions as our BBB. JW