Nice work Alan. Welcome and thankyou...
The Aussie 200 and 250 engines after 1971 went the to 3.75" crank flange with 3" bolt pitch (1962-2003 Windsor 221/260/289/302/255/351 style), up from the itty bitty 3.625" flange with 2.75" bolt pitch of the US derived 144/170/200 small sixes engines.
The Argentine 187/188/221 engines were what the Aussies copied, and they were still that small US style small crank flange. They used the 250 cam position, but were a half breed of small six rank bearings, and 250 Aussie cam chain, and so you just gotta make allowances for the crank flange diameter.
The US 250 went SBF on the crank snout and crank flange, and the US 250 has either the rope seal or 302 W neoprene seal.
For early 1964 to 1968 Aussie 200's, the neoprene replacement wasn't the bigger 3.75" Windsor SBF, it was the standard US replacement, but that Mitsubishi one should work on any Aussie 144/188 and 221.
The Aussie 250's copped and changed, went to a dog turd style seal for a few years, then to the EA falcon style seal and metric head bolt crank. The rope seal blocks can take the SBF Windsor seal for some years, but it varies. The 188/221 is basically a small low deck 200 that slept with a tall deck 250, but it uses the earlier 2.75" bolt pitch
You can do anything you like, but the two types of Aussie 200/250 neoprene seals are quite different to the US small six ones, but then went back to the EA neoprene so the OHC and X-flow blocks could be machined on the same transfer lines. Counter wallies and modders like us just have to be aware of the differences.
Ford are funny, they don't mind half breed mixtures at all, and they are quite happy to spend a few million on oddball seals if it stops 'em leaking oil on a customers driveway. A Mitsubishi seal is in keeping with the tradition... many millions of Ford trucks in the US have Japper Mitsubishi, Mazda or Jatco or French Bordeux gearboxes in them, whats a yellow peril seal among friends... :rolflmao: