Replacement NGS buffers for Chivers BBA kits

[Buzzard]

As supplied the Chivers BBA kits come with round buffers but I'd like to fit some wagons with what looks like rounded rectangular buffers.

The NGS do some that might be OK, code NGSB0204, but I'd like to be reasonably sure that they're a good match before placing an order.  The picture on the NGS site is a bit small so I cannot see for certain if they might be suitable.

Has anyone else used these NGS buffers and are they a fair representation of the rounded rectangular ones?

Thanks for any thoughts / advice.