Draw-in collet attachment:Handwheel and hollow draw bar, tapered closing sleeve and spindle-nose thread protector. If you need to make one, here is the data:
the draw tube is 3/4 inch OD and the bore at the collet end 19/32 (0.594) inch diameter. 
At the collet end it is tapped with a 26 t.p.i right-hand 60-degree (American) V thread, for a length of 3/4 inch.  The maximum diameter of the (female) thread is 0.645 inch, i.e. the depth of thread is (0.645 - 0.594)/2 = 0.0256 inches.

Boxford milling and dividing attachment. This cleverly designed, beautifully made but very expensive (and difficult-to-find) assembly features completely interchangeable components. The T slotted table, vice and dividing unit all have a mounting spigot identical to that used on the top slide - and so can be fitted either to the milling column, or used independently on the cross slide.
Additional pictures here

T slotted cross slide and boring table. Some cross slides had only one T slot to the rear, others had three or even four. The boring table, always a comparatively expensive option, simply slid into position in place of the cross slide; today, it is a rare to find one with a used machine.
New T-slotted slides are available, email for details.

Expensive when new and with few sold the "Little Giant" toolpost grinder is a sought-after and accessory. It was supplied when new in a neat fitted metal case