You can make new ones like I did for the 109 I used to have. 15 or 22mm copper pipe, flatten the ends and bend the flat bits to the required angle, drill and bolt on.
I'm tight
£32 plus postage.
1 MTR of flat alloy bar on eBay, same spec, £8.50 free p and p.
Knock a couple up in 20mins for 1/4 of the cost.
I'm careful not to open my wallet often.
I notice the 90 ones are a different shape to the 109/110 ones so not so easy to make out of copper tube .