1968 Triumph Bonneville rebuild.

I'm renovating a 1968 T120, which I've owned for about 30 years, but not
used for 20 years.

I've removed the crank, and cleaned out the sludge trap. The crank is good,
but it needs a re-bore.

Does anyone out there have any recommendations at to which sealant I should
use on the metal-to-metal surfaces when re-building. (i.e. crankcase halves,
timing cover etc.)

What oil should I use, and are those after-market oil filters which fit on
the return lines any good?

And where is the best place to obtain Triumph spares nowadays.

Best Regards,

Keith.

1968 T120, 1971 CB750, !957 Dommie, 1960 ES2, 1959 3TA, 1991 XT225,