There are some estimations here as I haven't had all sizes of all models in stock and there have been some variations over time, particularly with pads, so don't panic if your measurements don't match. Below is how I've made measurements - but here's a doc from Ghost measured slightly differently.
Ghost base dimensions 
| | Bambino / 16" seat | Piccolo / 17" seat | Standard / 18" seat | | 15" | 16" | 17.5" | | 18" | 18.75 | 20" | | 11.5" | 11.5" | 11.5" |
|
| Ghost panel length | | Bambino panel | Piccolo panel | Standard panel | | 20" | 21" | 22" |
|
| |
| Ghost pad dimensions | | Piccolo pad | Standard pad | | Spine | 21.5" | 23" | | Under panels | 24" | 25" | | Q/Q flap length | 14" | 14" | | R/V flap length | 18" | 19" | | Uni flap length | 18.5" | 19" | | Uni flap width | 16.5" | 17.5" | Uni short flap
length | 14.25" | 14.25" |
|
| |
Ghost seat dimensions
| | Model | Bambino | Piccolo | Standard | | Roma | 19.5"
9.5"
17"
8" | 19.5"
10"
18"
9" | 20.5"
10.5"
19.5"
10.5" | | Veneto | 19.5"
10"
17"
8.5" | 19.5"
10.5"
18"
9.5" | 20.5"
11"
19.5"
11.5" | | Quilty | 13"
10"
17"
8" | 13"
10"
18"
9" | 13"
10.5"
19.5"
10.5" | | Quevis | 13"
10"
17"
8.5" | 13"
10"
18"
9.5" | 13"
10.5"
19.5"
11" | | Florac | 12.5"
8"
17"
~11" | 12.5"
8.25"
18"
~12" | 12.5"
8.5"
19.5"
~13" | | Italy | 19"
13"
17"
12.5" | 19.5"
13.5"
18"
12.5" | 20"
14"
19"
12.5" | | Lipica | 21"
10.5"
17"
10" | 21.5"
11"
18"
10" | 22"
11.5"
19.5"
12.5" | | Flamenco | 20"
12"
17"
11.5" | 20.5"
12.5"
18"
11.5" | 21"
13"
19.5"
11.5" | | Puro | 7.75"
NA
17"
~9" | 7.75"
NA
18"
~10" | 7.75"
NA
19"
~11" | | Puro Plus | 12.5"
NA
17"
~9" | 12.5"
NA
18"
~10" | 12.5"
NA
19"
~11" | | Torino | | 19"
13"
18"
9.75" | | | Western skirt | 22.5" | 23.5" | 25.5" |
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