2652 is close but not quite right. I purchased it to upgrade my 6:1 to 7:1, and while I made it work, it's not the perfect fit. The eyestrap provided with it has hole centers at 1 1/4" which are too close together to align with the bolts that go through the 150 cam cleat (1 1/2"). And if you go up a size on the eyestrap, the spring provided is too small to fit around the loop.
My solution was to purchase the low profile eyestrap (201) then cut the spring in half and reassemble. Works, but the block does favor one side or the other rather than standing straight up, though it doesn't seem to affect performance. I think the appropriate component parts are 2650, 137, 071 - though not quite certain on the 071 spring.
Big help. Much appreciated, Pete!
'82 Hobie 18 SE with '85 Nationals Prism (White) sails
'73 Laser HID# 3463