I not long ago bought the H F dual cyl 3 1/8" clear specifically for our CF for $100 on sale . Works great . I have a bunch of their stationary jacks , some w/ in the bad s/n group & some not . Have 4 supporting a 38 Ford coupe for yrs & not going to mess w/ them .
However , by no means am I condoning use or purchase of these jacks .
Also made extenders for my metal drive on ramps out of 2x10 pcs producing a gradual incline accepting the CF .