Sure I have one from a 140. Whether it is worth sending is, of course, another question altogether.
The graticle is divided into squares, they can be 0.9cm, 1cm or 1.2cm most commonly, but I would assume the round CRT doesn't have an internal graticle anyway?
Look for a CRT from a 545 or similar scope, probaby fit. A rectangular CRT from the newer scopes should fit, need some metalwork though.