Can't help on where to get a SAAS boss kit, but first thing you should do is remove steering wheel and count the number of splines on the column.
Apparently they changed them a fair bit.
Mine turned out to have 29 splines('98 model, no airbag).
Also be sure you don't have airbag too.
I'm pretty sure that airbag models all have the rectangular looking centre area in the steering wheel, with horn buttons near the top spokes.
Non air bag have a dinky looking steering wheel type, with a central round horn button.
my person opinion and preference here: but I never liked SAAS steering wheels. I found they flexed too much in their spokes, and they felt flimsy.
MOMO and Nardi both awesome wheels tho .. bit pricey but worth the extra $s.
I had a SAAS in my Mini wayyy back when Mini's were Minis' and not 1 series BMWs!
.. removed it for a MOMO not too long after. Can't remember what happened to the wheel, but I still have the Mini boss somewhere, after about 30 odd years! 
LOL! still have an Andretti MOMO wheel .... after 30+ years! ... and the Nardi wheel after 25 years!
.. stuffed if I know why I kept them all after non use for so long .. but happy I did now.
my D1's steering wheel was all chewed out so I used the Nardi wheel after finding a boss for the D1.
Apparently the Defender bosses also fit(which is basically what I got), but you need to count the number of splines on your column.
The only problem with the Defender boss, is that even tho it fits, the rear section is not as wide as it is for the Disco, so it will leave an unsightly exposed area(when viewed from the side) at the rear of the steering wheel.
Also the Defender uses a different system for cancelling the indicators, and the Disco 1's is built into the steering wheel .. so I had to cobble up a small ring, cut to suit the appropriate slots on the column.
Arthur.
All these discos are giving me a heart attack!
'99 D1 300Tdi Auto ( now sold :( )
'03 D2 Td5 Auto
'03 D2a Td5 Auto
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