Bush measurement

[oldgeebee]

I'm looking to replace all the bushes on my '79 3000S and looking round at what's available. On the Superflex website they have 2 types for "early" and "late" M-series and imply the change date is around '72 but advise to measure. Quote "for most 'M' Models from Late 72, with Housing ID of 1.030"- 1.035" **Note: will not fit earlier models with housing ID of 0.985", the only way to be certain is to measure"
Being a 79 car, I thought it was a safe bet that mine would be the larger ID but I'm measuring just under the smaller one (0.976") using an internal vernier guage. This is the smallest ID of the bush housing - there seems to be a large chamfer at each end which I am ignoring.
Am I measuring correctly or have I missed the point completely?
GB

[oldgeebee]

and I always thought that size mattered .....
GB

[oldgeebee]

Adrian@ said:

I did try.... see the link above.

The diagrams imply that the ID in both cases is 1.000" with the difference being the size of the internal chamfer. This raises the question of why Superflex quote 2 different ID's for early and late model M's?
GB